No need for rotating nut there!?! How long is the X travel? I have 1610 screw on my machine, with both sides rigid end supports/ made to mill aluminum/ and my travel is ~1300mm, ball screw length is 1520mm/ including end machining both sides for the fixed supports/

No whipping or whatsoever at 20000mm/min and 3000mms2 acceleration, though for the moment i run it at ~7000-10000 machining wood, which also is quite fast.