Ok, so here's the @Lorspeaker ©MikrosHearThruBass mods with a rabbit HOLE size adjustment tweak.
The hole is just a wee bit smaller. I used the double sided tape and just punched a hole through with the small screwdrivers.
I think this is working very well for me. Still an awesome amount of sub-bass, but just keyed back enough such that I can retain my fillings :)
Question: the top picture is of the left driver. Looking down the rabbit hole, I don't see anything obscuring the hole. Below is my right driver where you can see that the hole is half obstructed. Anyone else notice that?
When I dampened with dynamat, I did notice that the subbass only increased slightly. I feel like this made it gain an uncanny mix of dynamics, musicality and accuracy, for example, when someone hits a snare drum, you hear the snap, and then the proper speed and tone of decay. In comparison, my Grado sr125i (which i still do enjoy) can clearly tell you the snap of a snare drum, but it sometimes sounds like it decays just a little too fast. In the dynamikros, you can hear the snap, and the slight vibration of the reverberation of the snare that gives it the proper sense of speed. I guess its just the smallest details in the recording being revealed to me.