I'm scratching my head on this one, and I can't quite understand how to fix it.
I have a slight edge relief on both my Veritas 5, and my Veritas # 5 1/4 planes. I use the MkII honing guide and DMT diamond plates for my final bevels. Primary @ 25 deg., secondary @ 27.5 deg. I hesitate to call them cambered, I've just relieved the 2 corners.
I'm planing some Red Alder, and the #4 in particular, leaves a scratched surface. The # 5 1/4 less so.
Yet, when I plane with an old Stanley #5 with the original blade, no camber, I get no scratching.
I have not yet planed any of my Oak, or Maple, so I can't comment on that yet, but it sure seems strange to me.
Any ideas?