I can't get the plane to work with the oak I use that has grain in whatever direction. Card scrapers don't work for the same reason, but also there's no way to control depth.
Using the router and a flush trim leaves a bearing groove. At any rpm or bit or router I have. Maybe they're all dog crap and have balance problems?
I think using a router with a jig like this only works if the ply is perfectly flat.
Using a table saw and an aux fence like this only works if the ply is perfectly flat.
I suppose my next step would be to buy a new router and bit and see what happens.