Well done effort. My only comment/critique/suggestion is... verify just how much your 2 windows are effecting the sound. I have 2 windows in my room, thought I had them handled via absorption placed and such, then I noticed I had a cheap stethoscope, so I grabbed that and put on some music pretty loud and listened to the window, which is a bit tricky because you're in a room with loud music, but lifting it on and off the glass gives you perspective.... My windows turned out to be quite evil, likely because of how they are mounted to the cinder block building. The resulting improvement was major. So, get a cheap stethoscope for like $5 and see what the sound of your windows really is. If it is making higher pitched than the music noises or screeching noises... I stuck some 2" 30 Duro Sorbothane pucks on the glass and that slowed it down to non-damaging. Cheers.