I have recently put a SH12 screamin demon in the bridge of my SG copy and found it really brittle with distortion, grainy and trebly it lacked mids, and sounded even worse clean. I couldn't get it to sound good in any position even if I raised or lowered the pickup. Is it supposed to sound like this?, I bought it used with the model number 12B on the back, I am assuming it is the right model.