I did a graphite trode a while back aprox. 10"x5" 2" thick lots of drafted sides and fins. On a boss part I will sometimes use parallel with a 1" index mill, makes quick work of extra material. It will remove a ton of material in a hurry without killing tooling. I never use the 1,2,3 section. I rough out a cavity with z level leaving .050 then a series of finishing with line tolerance around .001-.005. Then shine it up with the finer settings.
What I mean is I do a single rough hit then only select certain surfaces to do a semi-finish with more aggressive feedrate and stepover. For me it is easier to program doing it this way. Because once you get a certain strategy to how your going to do it, all you have to do is copy and paste. Then turn the same semi-finish into a finish. This works well and doesn't cut a bunch of air.