Guitar Feedback? EMG Active 81/85?

My guitar has a costant feedback, especially on distortion. It's noticable on clean, but it's faded. When I put it on distortion it's really really loud and annoying. I know it's not in the wiring because a tech set most of it up for me and fixed all of it. No matter what I do the feedback is there. It only goes away if I move around in certain parts of the room, or face it directly up or down. I've tried it on multiple different amps/cables. Still there. I've adjusted the pickup height accordingly, still there. I've made sure there's no electrical interference. It also goes away if I lower the volume on the guitar, but the tone sounds very bad when i do that. Same with the tone knobs. I'm running it through a Peavey Vypyr 30w, and a Boss DS-2 Distortion. The feedback is still there when connecting the guitar directly to the amp. Would this have anything to do with the ground wire? I know they're not supposed to be used, but its just laying in the cavity. I tried taping up the end of it with electrical tape, but nothing changed. I've heard that connecting the ground takes away feedback but creates a shock hazard. My pre gain is at 1 o' clock. Same with my Post Gain. This feedback is extremely annoying and gives me migraines. Anyone know what my problem may be? I can't find an answer anywhere.