Wow, you guys are hard-core! I sikaflexed my canopy and found that the plexi pulled the frame outward enough to cause a lot of drag on the wheels when opening/closing. So I gently pulled the bottom of the frame together and used duct tape to hold it there (about 5 strips)...then set it out in the sun for a few hours. That worked.
It may be a problem repeating what I'm doing this time of year, though...depends on where you live!
Also, I've heard that almost all canopies are tight when first fitted...they loosen up over time. I've noticed that on mine, too.