Hey Ger21,
I followed the Mach setup videos & doco in conjunction with the motor and driver recommendations. Full speed is just my way of saying "jogging at 100%". I am happy with speed of the motors which is well inside the maximums for the motors. My motors were stalling at that speed only when 2 or more of them were running. Thanks to the forum I changed some Mach settings and that helped a lot but at 100% jogging rate they were still stalling from time to time albeit a lot less. That's when I added the connecting shaft on the X motors and upgraded the drivers. Had no problems since, but the shaft came off this morning.
Cheers
Rod