Update: Last week I had already ordered two 960 oz in stepper motors. Yesterday I replaced my 600 oz in motors, z and y axis with these new motors. Tested my systems new operating limits, I raised the y axis as high as 300 in per min and my z axis to 100. I ran two programs and had no issues with my z axis rebounding or the y axis overheating. The new motors highest temp during 3 hours of testing was 60C.