I think I might have found a solution hopefully. I ended up getting 3 separate regulated supplies so I can dedicate one for each axis. They're pretty high-quality Lambda's rated at 48V / 10amp but are set to output 42V and I got them off the block for $25/ea.
I have read mixed things about regulated supplies so I'm going to have to find out how these work w/ my setup once I get them in hand. Anxious to see how it can handle the spikes that might occur. Will post my results when I have them.