Doesnít the Stepperworld controller use microstepping? I looked at their web site and they talk about it in a document, but I canít find it in the specs. Anyway, you need to multiply your steps of 78.74 times the microstepping amount of 4 or 8 or 16, whichever the board is set to.
Another thing I noticed is your velocity is set to 200 mm per minute. This is pretty slow. Crank that up to about 1000 (40 ipm) for starters.
And maybe you have a mechanical bind somewhere. Can you turn the motors by hand without power applied?