After trying to machine some small Aluminum parts, I had problems even at 1200mm/min. In the end, after doing a lot of tests and studying the problem, the CAM processor is the main culprit. I use a lot of trochoidal milling as it produces much better results on a not-so-rigid machine. The CAM software produces some sudden direction changes in specific situations, so specific that many times they do not happen at all.
I have found a pattern that easily reproduces the problem. In the end it was the maximum jerk being too high! 900mm/min instantaneous speed change for an 10kg gantry is anything but normal. Maximum feedrate of the WorkBee is 2500mm/min!