Help: Jp16

Hello everyone one. Maybe someone here can help me with this issue. I have a JP16 that has a feedback issue on any high gain amp at moderate to loud volumes it feedbacks uncontrollably. It defeats both of my gates (Horizon Devices Precision Drive and ISP Decimator Rack). People told me the pickups must be “microphonic” so I sent them to Dimarzio to be re-potted but they came back and the guitar still has the same issue. My JP6 does not have this problem. I have played it through my Kemper, Archon, VHT Pittbull, Sig:X, and Boogie Mark IV and it does it with all. The moment I stop playing it feedbacks in a high pitched tone. Is this common in this model? Is it the pickups or ported body? It’s unplayable in live settings. Any help would be appreciated.