So I just recently put a set of LaBella Black Tapes on my American Standard Jazz Bass and absolutely love them. The only thing is that I am now hearing a hum whenever I'm playing. I've read about Tapes causing grounding issues. I've placed my hand and some metal strings on the bridge and around the input jack and the hum stops. Currently my bass still has the stock pickups on it. Any advice on what I need to do in order to fix this issue?