My old RV-6, that I purchased about 20 years after it was first flown, has the UHMW guides, and also had a cuff sticking up about 3" at the top outboard corner of the right seat (intended to guide the canopy away from the seat back) (one of the first changes I made was removing that thing).
I quickly found that the easiest way to deal with the canopy askew during closure is to simply reach up and grab the aft end of the canopy in the middle as soon as it is within reach, letting it down without the side-load induced by holding it on the side. Not perfect, but effective enough.