OCD! Welcome to the club. I love to run accurate set-ups and will often seen way too much time trying to achieve things that may not matter in the larger sense.
P:ewer feeders are not absolute critters. They are soft rubber in the world of hard machinery. Try running stock (samples as in my previous response) with the body parallel to both table and fence. Then try a few offsets to see how your stock moves. I think you will always want the wheels parallel to the table. And I'll bet you will have a slight - 1/8" to 1/4" offset relative to eat fence. This will pull your stock in tight to the fence and hold it for a great cut.
I cannot say enough good things about power feeders. They simply do a lot better job than I can do, and don't get tired or bored.
This might scare you off, but we often use the feeders in a climb cut situation. Thats, the wood is traveling thru the shaper in the same direction as the cutter is rotating.
Climb Cuts are not for the faint of heart or weak of mind. Smaller cuts tearing out along an edge is when we do it. Larger cuts - we feed conventionally. A power feeder can do the climb cuts if you need it, just be aware that smaller cuts are better than large, heavy cuts. Also, do not stand by the (normal) indeed area, in case a piece decides to come out at increased speed. Increased, like a rocket.