GG’s

I’ve only used incannel  gouges a couple times.  The first time was the quarter
round cope joint in
early window sash.  You occasionally see a chisel for making this joint come up
for sale.
My question about the inchannel, is the back suppose to be absolutely flat like
a bench chisel?
The chisel is crushing the wood on the inside curve and I could never get knack
of using the chisels.
Any help.

Tommy Hall
Amesbury, MA