Here's an update. As a warmup on my max effort bench, I chalked the bar and saw that the bar path is not always the same over reps. I'm trying to fix that. One thing that seems to help is to keep my entire body as tight as possible throughout the lift. That means no slacking in the legs, butt, and upper body. Its harder than it sounds, but it seems to work.
I will keep checking my bar path until nothing moves any more. Tweaking my form is a pain in the ass, but I'm sure it will be worth it in the long run.
"PRove the impossible"