FWIW,
After more listening time and comparisons with stock T50RP's, LCD2's, and another mod set up differently with regard to plasticine quantity and placement, I have concluded that, for me, "Less Is More" is "Less Is Less." Medium Mass Loading with plasticine or tungsten putty works better, for me. So, you could try this with stock bass port felt in place, white driver felt or Transpore tape over the back of the drivers, acoustic foam of choice in cups, and Dynamat (or similar material) with felt over-lay around ear side of drivers (optional):
1. Flush application of plasticine in the baffle compartments.
2. Add ~ 1/2 inch "wall" of plasticine around the driver perimeter and compress it against the driver housing, tapering down to the inner area of baffle-filled compartment. You should now have a 1/4 inch "wall" around the driver housing extending out about 1/4 inch into the inner-most baffles compartments. I find that Medium Mass Loading this way provides more bass detail and quantity, as well as decent treble, than either Flush Mass Loading or "Less Is More" plasticine placement. Generally, less plasticine reduces bass and increases treble, in my opinion.
3. Fill the cup outer rings with Paxmate instead of plasticine. I find that Paxmate provides a consistently good seal that remains constant after multiple openings/closings when making other mods or changes to your configuration. Plasticine in the outer cup rings tends to get messy and "migrates" to other areas with multiple openings/closings, losing its initial tight seal.
4. I've changed my mind about pads after comparing stock vs 840 pads with a variety of mod configurations. You could try Shure 840 pads for an economical solution for a better seal, better comfort, and improved bass. Pad "lifters" of different diameters and lengths are optional. Tightly rolled up Kleenex tissue glued along the seam works well and stays in place pretty well after compressing them under the pad cushions (ear side of pads).
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I've modded mine this weekend, used some variation of Less is More mod by BMF and some advice from hennyo (btw, thanks folks). I have:
1. Plasticine in the baffles, though not on the outer rim. Pressure equalization vent is open.
2. Paxmate covering bottoms of the cups only. Bass port is open and covered by stock felt.
3. Donut of the hard closed cell foam (5mm) attached to the stock pads to raise them.
4. Medical cotton teased and stretched in the cup space. A lot of it, like 1.5x more than BMF Less is More.
5. Additional cotton under the back of the stock pads to angle them.
6. Bent the headband to make it egg-shaped and distribute the weight more even.
I've only started to listen to them at the office, nothing at home can drive them reasonably good.
Mid range spike has been reduced substantially, though I'm still hearing it on vocals and pianos. Since now I notice it on any headphone I have, maybe it is something with my psychoacoustics). Bass is slightly dry. Instrument separation, soundstage and naturalness are best of everything I've heard before.
I've been told mods are quite dependent on pads so I'm waiting on shure 840 pads to arrive, so I can try them and compare.
Snatched another pair from b&p for me and a converted friend of mine. Gonna mod them with AcoustiPack and Dynamat (kindly provided by BMF) when I get them.
