Thanks G-Bob. It does seem like our issue (yours rubbing upper right - mine is left but same deal), but I can't visualize how the timing of the passive and active sides of the slide (which would be a horizontal tilt), results in a vertical tilt of the slide. I will use a tape measure to see if one side is further in/out than the other and read up on how to align the timing for that.
I shot some video to try to better show my issue. We winterized it a week ago and will retract and cover it probably over thanksgiving. Hoping to make a useful adjustment.
Thanks for reading.