I purchased one of those cheap loaded pickguards for my strat to change to a humbucker sound...it starts to sqeal at high volume (i use max gain)...so...I changed the bridge pickup to a Seymour Sreamin Demon...which I really like....but I still get a lot of squeal...less than before but still a lot....any help?, advice?...is it because the strat is very hollow, as compared to my Robin....