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My blades cling to the glass making them hop around. Drives me nuts. I've waxed the glass, applied Rain-X, whatever, works for about five minutes, then goes back to tacky/sticky op.
When you say "hop", do you mean they chatter as it travels in one of the directions? I had this issue and a littlel tweaking on the wiper arm to correct the angle of the blade cured this issue for me.