I recently bought a second guitar with the EMG81/85 combo and the EMG81 in this one really doesn't sound like the first one I bought. It also gets microphonic as hell at any volume above a whisper. Feedback is non-existent with the other guitar so something is wrong. This newer guitar was bought used and it's such a bizarre phenomenon I'm wondering if the guy that traded it in ripped out the original pickup and replaced it with a chinese copy. Anyone ever heard of an EMG81 feeding back a lot?