Thanks for all the replies everyone. Huge help.
Since your bit does not have a bearing how are you aligning the depth of the fence with the bit? Sounds like you are using a split fence. Use a straight edge that reaches end to end & make sure that the fence is aligned even along it's length. Sounds like the outboard fence is back behind the cutting surface a little more than the other one.
If you are machining the whole edge then you might need to shim the out feed side to compensate for the material you removed. Much like a joiner where the out feed side is higher than the in feed side & the difference is the amount the the blade is removing. Your fence maybe aligned straight across with the bit but if you are machining the whole surface the out feed fence would be to shallow as the material exits the bit. You would need to shim it out. Hope that makes sense.
This is my bit: Item #91715 at Rockler
And this is my table/fence: Item #21037 at Rockler
(can't post links yet)
The bit does have a bearing, but for my purposes it wasn't usable (board too thin to reach bearing). Plus, the cutting profile of the bit goes inside of the OD of the bearing, so that especially doesn't make sense that the bearing is there at all
I aligned the fence just a fraction of an inch behind the inner-most cutting surface of the bit. The fence goes strait across the full width of the table.
Having read your post, I believe you are correct about the out feed side of the fence needing a thin shim to compensate for removed material. It makes total sense now, and I feel a little ignorant for not realizing what was going on.
....You are removing material so when the wood reaches the outfeed side of the fence it is not supported even though it looks like it is....
It absolutely looked like it was supported on the outfeed side. And that's one of the reasons I didn't realize what was going on my own.
Really I felt that I was removing so little material at the innermost part of the bit that it wouldn't make much of a difference. Wrong.