I do agree on the Triple.Fi 10 comment. If you want some emphasis on bass and emphasis on treble, the Triple.Fi 10 is a very well balance and blended earphone with a mild V profile. A good foam Comply T-500 tip can tame the top end down a little and make the fit a whole lot easier to work with as they can't be inserted deeply. Tip choice is very important to being happy with fitment and seal. The presentation is very "club" like in nature, enveloping and robust. It's just plain fun to listen to. Treble is one of the most extended and detailed out there, but it's a sweet type of treble that's just nice to listen to, even if exaggerated. Bass is thick but clean (yay for BAs), and robust. It doesn't dig supper deep without EQing, but it's enough not to desire more. It does respond well to EQing though. It rolls off at 50Hz kind of sharply, but it can do 30Hz fine (some simply lack capability regardless of EQing). The pricing is good for the performance it offers. It was outstanding last winter. It does offer good bang for the buck, but some folks don't like the fitment issues. I just suggest grabbing a S/M/L pack of Comply T-500 tips and making it easy.
The MTPG is a neat earphone. From a general standpoint is a very good earphone. It's well balanced. It has a clean extended response on both ends. Bass is well controlled and tidy. Mids are smooth and natural. Treble is smooth and subtle. I can see why you might want a bit more treble emphasis, because that is a preferential shortcoming of the MTPG. Treble is just kind of soft, and a good number of people would probably seek a little more edge and sparkle.
While you do seek more treble, I would like to suggest the Fischer Audio Eterna, mainly the v1. It offers the bass aspect you're looking for with excellent emphasis and extension. It's a looser bass than the MTPG which helps provide a fullness and body to the notes. It reminds me a lot of what you would think of as a car audio setup with a sub in the trunk. Now the Eterna doesn't really offer a lot different in terms of mids and treble. It is again well balanced and with good extension, but it's still mild mannered. They don't have the thickness and texture of note the Monster has, but there's better separation and sound stage to Eterna. Outside of the IE8 and UM3X IEMs I haven't used another with as well extended of bass with the emphasis you would prefer. The benefit to the Eterna is that it's quite cheap, so there isn't much harm in just trying it out. The v2 is more balanced than the v1, but the few who have tried both do think the v1 has more fun factor to it and more pronounced bass. I've EQed down the Eterna and flattened out the response, and they do lose some of that fun sense to them. I can see why the v2 is perceived more mild mannered. Should you just buy the v2 or try and find a v1? I don't know. It's not like they're vastly different from each other. Since you do want bass emphasis, it might be desirable to find a v1 in the for sale section.
I may also lean you towards trying to find a used IE8 as well. Because you do want bass emphasis, I do think you might really enjoy the IE8. There's more edge and energy than the MTPG, and it sounds like that's what you seek. The bass is well emphasized, but it seems you do want to be geared in that direction. The mid and treble are well balanced like the MTPG, but the bass emphasis, while centered at 100Hz, does extend up to 1kHz which creates a warm presence. The presentation is less smoothed, but with the bass gearing of the driver, the top end treble does start to smear in detail a little. It still comes across crisp and extended, but it does become obvious that the driver just doesn't have the speed above 10kHz to articulate everything. The actual extension is very good though. My hearing ends around 15kHz-16kHz, but it does extend to that just fine. The sound stage is massive, just a big sound. It's one of the enduring traits of the IE8 and one of the most liked. The only downside is everything is distanced. Far away sounds are far away. Close sounds are far away. There's excellent separation, but layering is minimal due to the type of presentation. It's like watching a concert in the grandstands. Some other earphones put up a lot closer to the stage or some right on the stage. Sometimes the presentation is preferred. Sometimes it is not. For a high end earphone of a similar value to the MTPG, it's certainly one I would suggest looking at. Pricing has been pretty darn good with these earphones with an excellent sale every now and then. Using pricing is very good too. The Sennheiser and Shure earphones are a couple of the most what I'll call luxurious brands out there. The fit and finish is just excellent. There are a lot of fakes out there though, so there needs to be care when purchasing them. The big give away is the S logo on the earphone. The real is clean and tight in design. The fakes are sloppier, more rounded, and with more gapping between the box lines going around the S. This earphone needs to be broken in to get loosened up. It will sound a little tight and constrained until done so. It doesn't need an amp to sound good, but they LOVE wattage and will use it up if you have it. They have a ton of output capability, and the bass cleanliness, control, and extension is some of the best. A mild, very wide EQ cut at 100Hz with the bass knob all the way full will balance out the response perfection, and it will run you from 20Hz to 16kHz no problem. While I do consider something like the Triple.Fi 10 a slightly better product, some will argue against this, the IE8 is more natural sounding and impressive out of the box. Something like the Eterna is a great, cheap option that kind of mimics what the IE8 offers, so the Eterna is a great option itself, different but the same kind of gearing. The IE8 just feels special though, and it does certain things amazingly well.
