What oal are you using? I tried .940 all the way to .980. I expected them to hit the lands, but that never happened. Interestingly, it's the shorter ones that whack the slide stop. The longer ones hang up on the Feed ramp. There's no goldilocks zone where neither happens.
I suspect weak mag springs might be part of the problem with the Feed ramp hang ups. My magguts will be here next week.