I found when I turn them around I nerd an almost flat against the face angle on it trys to dig in no comfort. But i do use them both ways. Just gotta watch them closely.
So what is the best way to hollow the omote ? I tried a Dremel with sanding drum, which worked but looked messy, then went to a piece of dowel wrapped with 220 sandpaper, and that seemed to be much more controllable with no heat issue to watch out for.