Good, thanks for the update!
If you let the strap roll up all in one place, it effectively increases the diameter of the roll at that point. If it was right near one end or another of the tube, then the end with the strap would roll up all the fabric faster than the smaller end because the "roll" is bigger. Rolling the strap at a slight angle helps spread the extra thickness out along the roll instead of in one place. I may not be explaining it well, but I hope this reply makes sense.
2003 Ford F250 CC 4WD, 7.3L Powerstroke, 6-speed. Great camping truck!
2003 Layton 242 Scout; Extra batteries, propane, and solar panels to hide out in the woods for a long time!