Well, now I can say that I'm completely finished with these headphones. Well, until I find another pair of headphones that I like more than these. I redid the whole mod again, and I can say that the electric tape did nothing to the sound. I guess it was a placebo effect when I first did it. I've renamed it to the Pro700MKII Bass Mod instead of the Sound Correction mod because it seems more appropriate for what the "mod" actually does to the headphones.
I also did some more tests to the headphones: I unscrewed the four screws (leaving the drivers and earpads still connected to the silver ring) and listened to the headphones that way, and there was no change that what it sounds like when the headphone is screwed in. When you block the little holes behind the driver with your finger while listening to it, it sounds boxed in (like you put your hand over open headphones). I tried using an X-Acto knife to remove the white paper that covers the holes on the driver, and I started on doing one of the holes, but stopped because I was afraid I was going to puncture the driver. The drivers were tuned to sound the way they are, I like the sound, and I'm not going to risk screwing up my headphones. Maybe if there is a headphone that can replace these (better at everything), then I'll reconsider, but for now, I'll keep them the way they are. I was thinking about putting some dynamat on the headphones, but now that I really look at how the headphones are constructed, and how the drivers are tuned, there wouldn't be much of a change in sound quality.