[tr6scott]

Sorry, I did not read the whole post or look at the code, now that I have, your mistake is you have multiple motor outputs in multiple loops, so some loops are telling the motor to turn on, some are turning it to turn off, you never know which command is last processed before and updated to the actual hardware.

There is one motor, there needs to be one motor set, then your program needs to control what speed you are telling it to run.

EDIT......

From your description, it sounds like you want to control 4 motors that are not on the driveline, but you RefNums are the same, I also can not see your begin, you need 4 different motor set refnums with unique names.