i used the keling kit with 900ozin on Z and 381 on the XY.

The X is rated at 900oz but the drive is only delivering 3.5 amps so i think it is 500oz.

Have you go the motors and and drives because i would recomend the kelinginc kit as the motor are low impedance and give the best performance. UK motors seams to have a lot higher impedence and poorer performance.