cut off
I have a roland sp540v and have had some issues with my cut being off. Running slower speed helps, also make sure the heaters have been off for a little bit the heat kicks up the expansion/contraction and can make cut off. Cleaning the clear strip helped mine significantly and also going through the calibration process, there is even a cal. process in the service mode that is great, much better than the user one.
I do a lot of small decals and that is where the issues arise try to run them in smaller batches. One test is to do a print then cut w/o lam and that will tell you if calibration is off, get this corrected first then move onto the print/lam/cut process. If off then, it is either an alignment problem or the read calibration for scanning the registration marks.
I've gone round and round with my roland dealer and they keep telling me it is the pinch rollers binding. I have checked them and the bearings are smooth as glass. Also use more pinch rollers the more you have the easier it is for the vinyl to be pulled into the machine. On long cuts I try to use a table on each side of the machine so machine does not have to fight gravity so much and I help along to prevent it from getting shifted.
Try these things to see if it helps, I feel you pain on this and it waste a lot of vinyl and lam to get it on the money.