Many of us have Graphtecs, they don't have rulers and NEVER needed it. I don't line up to anything. Measure your wheels equally to the edge of the vinyl and your tracking should be fine, as long you start your vinyl straight. I just measure about an 1.5 inches in. You should NEVER be pulling from a vinyl roll while cutting. You should always have enough vinyl slack behind the cutter to do the entire order. Prefeed your vinyl for the order. I have a 30" Graphtec, they only come with 2 pinch rollers, can't imagine having 4 pinch rollers. There is no need. 2 Pinch rollers, track perfect. ( Maybe try only using 2 pinch rollers, instead of all of them) Graphtecs have separated grit rollers. I don't need to add anything to know where they are. There are markings above on the carriage rail track.. Prisimcut states it has arrows. (Position pinch roller under arrows.) Vinyl does not lift up or blade does not scratch the vinyl. Maybe? You have the blade too far exposed out of the blade holder. There is incorrect instructions out there, with setting blade depth with a credit card or post it notes. These are WRONG and way too much blade exposed. This is the correct way to set your blade depth correctly.
To start with, you should set your blade depth correctly, by taking the blade holder out of the machine, and firmly cut across a piece of scrap vinyl, you will be cutting. You should only be cutting the vinyl and barely a mark on wax paper backing, Adjust blade to get there, Then put the blade holder back in machine, and use the force of the machine to get there, same results, only cutting the vinyl and barely a mark in wax paper backing. You should just barely see and feel your blade tip out of the blade holder.