Yes, those numbers are correct. Although I just use online calculators, less room for error.

I would go for a bite offset of 15mm tops. Even an offset of 10mm will give a huge single tooth effect, proven by how 720, for example, has just ~10mm deep teeth and obviously gets good bite. More than necessary and it's just dumping weight into the counterweight - mass which is better off in the sides of the beater.