I switched my Nuovo Record brakes over to Koolstop Salmon (from Campy pads) and I have had nothing but squeal from them ever since. Rims are anodized Mavic MA-40s.

I took a rasp to them to get some more toe in (not wanting to bend the arms). Worked for awhile, but now it is back. I just put the Campy pads back in, but was wondering if there is anything else I can do to the Koolstops? Or another pad to try? I read some stuff on the Mechanics forum (BonAmi cleanser, etc.). As for cleaning the pads, what would you use?

I'm asking here (instead of Mechanics) because you all seem to know your stuff on vintage equipment and I thought I might get a better answer here.