takes a little practice
It takes a little practice to operate the tip-up without banging the opposite side on closing as you describe. When standing on the pilot side and you're closing the canopy... As you are lowering it down and you get to the last 12" or so, the whole thing is twisting so your side is out a little and the opposite side is in a little. As you're lowering it, you have to push just a little bit so that the canopy doesn't twist towards you. If you just hold the canopy 6" above full closed, you can feel how the canopy moves as you push it a little. Once you practice this a few times, you'll get a feel for how much of a push your canopy needs to close properly.
2010 RV-7A - 1000 hrs and counting