So I wanted to leave an update on the mod.
First I think it lets the mids and vocals come out a little more so it sounds more lifelike.
Second Cymbals also sound more real than they did before. So the highs are better balanced now.
Third and not least I can listen to music longer without fatigue. I've listened to them for hours no problem. Which is a big plus.
Conclusions: I'm definately happy with the changes it made and I'm definately going to keep them like this. It added many benefits and no drawbacks. So thanks for the tip Matrixnobu. I didn't think I could get better sound than I already had. And like you said it only took 5 minutes! Ok maybe 10 for me because I had to find a real small screwdriver to remove the ring that held the foam in place.