Mine is a 71 kodiak. Shelf is not radiused so trying to think of ways to get cleaner flight with imperfect form as I progress.

Certainly no reason you shouldn't try a feather rest if you want to.  The only reasons I don't use them more is that they are a little fussier than a shelf rest, and they put the arrow a little further away from your hand.

Valid point. Maybe I should toss a strip of leather under the bear hair to radius the shelf a bit.