Tdock, no offense but it sounds like you're approaching this a bit randomly. The foam over the vent works because when the vent is too open, it reduces the backpressure on the driver, allowing the bass to get flatulent. Everything that is being done in this system is to solve a few specific problems. However, each piece interacts with others, so you have to be very careful to make one change at a time.
1) Kill plastic resonances: the guys are right. Blu-Tak helps but is nowhere near as good as dynamat or plasticine at increasing the mass of the driver baffle, which reduces distortion and makes the bass tighter, as well as killing resonances in the cheap plastic baffle.
2) Reflections within the cup. The raw plastic splashes sound around, which is what makes the stock version sound shouty and murky in the mids. Akasa solves this.
3) Damping the driver: the stock materials and vent felt were selected to be cheap and to match the characteristics of the earcups without mods, and the pads. Every mod is different, so adjusting how you damp the drivers is, IMHO, the logical last step.
4) A useful detail is killing reflections *around* the ear-side of the driver with thick felt or akasa.