I did not like cutting thru the layers of plywood to make a bigger radius. A looks issue.
So I tried to only radius within the outer layer (3 ply).
Worked just fine with laying the glass - no issues with it separating at the chine during lamination.

The only reason for the plane is to save some sanding. I don't think it is worth bothering with for a typical kayak.

On the other hand, one of the original designers of stitch and glue sailboats (trimarans) was Jim Brown who said you could radius all the way to seeing the epoxy fillet. These were much heavier ply panels with multiple layers of cloth at the chine. His boats sailed world wide, so if you beef it up with glass enough you can make it as big as you want.