I've been playing with Fusion 360 adaptive clearing in aluminum on the Nomad too. I am just using the Nomad tools - dry, but doing my best to keep chips cleared. I've had good success with high feed rates but no matter what I do I am getting crazy amounts of chatter when I attempt a cut depth greater than 0.01in. It's disappointing because I embarked on this experiment in an attempt to increase the depth of cut in order to use more of the endmill cutting edge rather than just wearing out the bottom 0.01in. From the looks of the surface finish in that photo it looks like you might have a similar issue, Remmy?
I've read a lot of comments suggesting the Nomad is likely to run out of spindle power before running out of rigidity but based on this chatter issue I seem to have the opposite situation. Any ideas what the weak link might be? Is it possible I am running into a stepper torque limitation, even though I don't seem to have any skipped steps? Is there just not enough stiffness in the belt drive? (Though, I note Remmy has a leadscrew drive Nomad Pro.)