Shoot 50 rounds of hot 124 grain nato ammo, leave the slide locked back for a couple of days and make sure you clean and lube it especially the barrel where it rotates and the top inside of the slide. If that doesn't make it 100% than the recoil spring is gonna be the problem. Your new spring is the one w/ the compressed coils in the middle right? Are you shooting PMC bronze by any chance? I'd stick w/ WWB until the recoil spring breaks in as well. Probably not the issue but the compact has an ambi slide release, your not riding your hands up high are you?