K, I figured it out. The problem was not the gun, but the shells. I have been practicing my speed reload over an over with the same shells, which has caused the rims to dish a bit, which has caused them to hang up on the shell stop. FN SLP still rules!!
You're not practicing speed reloading with live rounds are you? What if you decide to 'dry fire'?
Just ordered my FN SLP Mark 1.
Thanks for all the contributions!