He has a SP300, he is unable to add more pinch rollers.
As for you Mike, considering your performing a print/lam/cut procedure, if it is walking as much as your stating, are you sure you have the material perfectly square when you put it back in the machine to do the cut? This has happen to me on my printer and come to find out it was just me not having the material perfectly square when I printed it and then sheet cut it. I laminated it and stuck it back in and used what I thought was a straight cut on the lead edge and come to find out it was off about a 1/16th and do the math over a length of 7 1/2 ft you can imagine how crooked it was on the tail.
I always reload the material now and feed it manually to make sure it is straight before starting my optical line up for the cut.
Just my .02
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Groutch,
How did things work out for you? Did you get the problem resolved?