You are correct, Hennyo.
I did not replace the acoustic foam with plasticine around the cups' outer rings. I don't know, nor do you, whether or not there is a significant difference between these two materials for this particular mod and their effects (if any) in handling resonances unless we've made the comparison. Even if you (or I) heard a difference favoring one or the other, who's to say it's due to resonance attenuation, better seal, "factor X", or placebo? I very much doubted, however, that there would be any difference so I chose to keep the foam in place. I could be wrong. Plasticine in the outer rings might be the catalyst that makes everything come together.
I used Creatology Stiffened felt from Michaels. I bought both black and white. I used white but figured the color would not have an effect on SQ.
One of the photos shows the naked cup with electrical tape over the bass port...hard to see in the photo.
Measurements are kinda fun and graphs/plots are cool. Do you think, though, that if a set of headphones, modded or not, sound really, really good to you but measure poorly, that means you were wrong? Will they sound worse to you after you see their stinky measurements and graphs? Flip side - what if you listen to a set of phones and think they sound awful but later see their stellar measurements? Will they sound better after you see the graphs?
Edit: I posted this from my iPhone and forgot to add the wink emoticon to show this is a little joke with no sarcasm or ill will intended. I also overlooked your question about Paxmate under the ear pads. I used a 3/4" donut under stock ear pads but had to remove the donut to get the Shure 840 pads to go on; and it was still difficult. As noted in my previous post, the 840 pads worked better than stock by (I presume) better controlling the bass and clearing up the veil I heard in the mids and upper range. I mentioned that mrspeakers' use of Stax O2 pads may account for the exceptional SQ he derived from Rastapants 2 that I could not try since I don't have these pads.
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Monumental effort... but those are not Rastapants 2.... They lack clay around the baffle lip, (this privides a gasket effect, rather than the acoustic foam effect.. Doesn't quite handle resonances the same. and you didn't mention weather or not you have acoustic foam on the earside. Also, I'm not sure if that's the same driver felt as what we're using as all of the ratapants 2 users have black felt... And also, but I bet you did this. Did you tape the vents up?
We're going to have these measured in 10 days or so on the 23rd. Mrspeakers, Luis, and I are all going to meet in Irvine and measure these up really quick.