I hand push my bright cut,at least in silver, I use a 30* face and a 25* heel. But if you are using a hand-piece, You might go with a steeper face angle 35-50* depending on shat materiel you are cutting.
just straight heel for me. the only time i liked the radius heel was doing hobo nickels. 45-50 face- no more than 15 heel. i actually like a heel that's a bit less- 10 degrees or so.