I use 6mm 2f carbide 45deg alum carbide bits at 12000 rpm 900 mm/ min 1.0mm DOC. Any more DOC and the motor sounds loaded and risk of gumming up is pretty high.

I also drop the feedrate manually when deep into a profile cut as the chips are harder to clear.

I often manually drop the feedrate on the first cut as the surface seems to be harder than the core. Also my ramps in and pretty slow.
I've seen others post more aggressive rates but it does not work for my machine.

My tabs are about 3mm as you are not just holding the part but stopping it vibrate on the finish pass to get the best surface finish. Means you need to cut them out with a pad saw not just push them out .