I have been printing for a little while now, and just recently came up with a new design that is very narrow and in the center of the shirt. I have found that as I print them, the narrow image becomes very wrinkled: the shirt itself is not wrinkled but the image is all bunched up and does not look as long as it should be. Is there anything I can do to eliminate this problem? I am printing on 50/50 cotton poly shirts from Jerzees, and I have tried prewashing the shirts before printing and it helps somewhat but not as much as I would like. Thanks for any help you can provide.