Hey guys. I have a Warmoth strat build. It's rear routed and the pickups are mounted using black metal mounting rings. I believe I have shielded the cavities correctly. The humming is bearable when I'm not playing but when I touch the pickup height screws the hum/buzz gets way louder. Any ideas what the issue could be? Are there some kind of non conductive screws I could use or something? Thanks in advance!