Hmmmm, you talking about slotting or adaptive? 3flute adaptive work quite well.
Remember this? From here Need help testing cutters, near the bottom. 18v brushless Makita on 20v power supply.
3flute C3D stub (same one I’ve been using)
30k
.027mm feed per tooth
2750mm feed rate
0.3mm OL
6mm DOC
Bumped feed to 3250mm/min, as high as I want to go for now.
Oh and, no air, no lube.