Let me start with a quick note on EQ...I was asked how well the Minerva Mi-3 would respond to bass EQ, so I set the EQ on my 801 to +10 dB @ 60 Hz and while the result was nice for many tracks, anything bass heavy would distort. I didn't spend the time trying different levels of EQ to find where it would distort, but chances are a single driver will distort when pushed too far. Of course, your tolerance for distortion should be your guide.
Next, by doing your own impressions you are taking a larger risk than if you get them professionally done by someone that does impressions for CIEMs. I would recommend buying multiple impression kits so you can get it right, but then that could cost as much as a professionally done set of impressions. The pros use different material and they will check your ears, which is an important step, but the material is something that does make a difference for ease of use and better overall results. If your impressions are not great and lead to many refits, the cost will increase due to shipping and possibly additional impressions while if it done by a pro, they can usually help you with any fit issues. Something to think about.
You can add the Clear Tunes CTM-200 to your list (read jokers review) due to the price range. Not much is known about Alien Ears, but there are monitors from
Drm Earz/Audio Earz that may be good. From my short time with the Monoprice, I would say the JH5 is going to be quite different, but there is a very high satisfaction rate with that CIEM. The Livewire Dual has been fairly recently reviewed and the bass isn't the strong point, so check that out if you haven't. If you can stretch your budget, the Alclair Reference, which I am in the process or reviewing right now, is very balanced with a warmer sound, but not overly so. Alclair is also making many other monitors including one designed for bands is made to be very durable.
The AS1 has one impression that I know of, and it seems to outperform the IE8, so that is probably the way to go. The IE8 is a good deal warmer than the Monoprice anyways.