Just getting back into Fusion360 after a lengthy break :( surprising how much i forgot ;)

When doing CAM for a countersink tool, is it best to calculate F&S for the largest diameter of the tool?

My guess is yes as its not good to run faster than a tool expects so using the larger dia means the centre will be going slower.

I have a 16mm CS tool and for mild steel HSMadvisor gives me 500rpm and 80mm/min plunge - sound about right??

Is a CS tool ok for CNC or better to use a 90deg mill tool?