…..appears to be the same thickness ….
Appears ain’t the same as “is”. – lol When you’ve finished planing, lay the boards on a flat surface (saw table works great) and use your Mark 1 fingertips to feel for any differences. Not a digital micrometer, but your fingertips can detect very small differences.
…probably something I did not setting up the bits exactly right.
I don’t think so. If you got one side flush but not the other, it’s a thickness problem. If both sides are off, it’s probably your setup.
I have 7-8 rail and stile cutters and have spent quite a bit of time making trial cuts to get dead-on alignment. When I get it, I keep pieces of both the cope and stick cuts for setup blocks.
-- Adversity doesn't build character...................it reveals it.
