I just got one of my guitars back up and working. It was a gift from a friend several years ago. Its a Kramer (I know like 30 years old) and I'm having issues with my Floyd rose. I have the bridge set up perfectly straight. everything in tune and using the whammy bar works fine so I know its not issues of the alignment. The issue is that my guitar is making a ridiculous screatching sound when I have my amp loud using distortion. I know its not my half stack because I use my Schecter Diamond Series on it all the time and I don't get the sound. This is happening on many different amps also.

I looked up what could be the issue and I've heard that putting foam or a wood block underneath the springs could help because it could be due to the springs but, I put 2 Pieces of foam under it and I still have this annoying feedback sound. My guitar has old pickups in it but I wanna make sure its nothing else before i try getting new pickups. I do not know what types of pickups i have on it now other than one says a quad rail and the other two say dual rails. I'm assuiming thats what it is. I know i've typed a lot but I'm hoping someone can help. Thanks.