Love the barrel, hate the compensator - Killer Innovations Sig P320 Compensator

I purchased this product along with a Killer Innovations barrel for a P320 compact. The barrel is great. I noticed that my group sizes halved with respect to the factory barrel. When I initially added the compensator, I had several failures to fully extract and several stove pipe jams. When I adjusted the port adjustment nut out to it full extent (completely closing off the large, most aft port) the feed problems ceased but the copensator became loose with the second shot. After tightening to the point that I was afraid of stripping the threads, the compensator stayed on for three more shots before becoming loose. It also adds quite a bit to the length of the slide turning a compact into something just a bit longer than a full size. Not so useful for concealed carry. Love the barrel; the compensator, not so much.