Reply by Viktor

David, I actually tried angled bits, but
1) They don’t make bits this large. For a 20 mm (3/4”) stock it would have to be ~40 mm (1.6”) diameter V-bit.
2) What is sold as 90 deg. V-bits are not always 90 deg. by as much as 3-5 deg. It is not noticeable when cutting a groove, but in a miter it is very obvious. Don’t ask how I know.