Are you welding pockets or hems?
If it's hems, you may try using a weight or two to keep the hem in place. You'll have to remove the weight as the leister travels but that worked ok. If it's pockets with a little practice you shouldn't have an issue.
Some of the guys I worked with liked putting a little lubrication on the silicone wheel to help keep the vinyl from sticking to the wheel. I never really had a problem with it.
If your model is anything like the one we had I'd order an extra silicone wheel or two. It's real easy to damage them with the heat coming off the machine.
