don't worry about the friction - it's actually a good thing. If the jib flogs, your self tacker won't beat your beam to death (this also applies to trailering)! It will, however, align itself when the jib is sheeted in tight. I've seen them that are floppy loose and felt gyped...then I had one that was floppy loose and I felt lucky.

However, if the tacker is hitting the rivet heads, you probably need to do something about that because it will grind away at the aluminum. I had this problem with the I20 - the t-shaped stainless tabs aren't very precise.