I have agonized over correct upper swivel position both before and after my installation, with pennants both aloft and alow to maintain proper positioning with the sail where I need it to be.
I think my problem may be with the length of halyard above the swivel: I left enough bare stay above the wrapstop puck (about 14") to be able to slide the foil/drum up if necessary for maintenance/inspection of the otherwise hidden turnbuckle and terminal alow. With the halyard exit aloft less an inch from the stay, and a foot of halyard to the swivel tang, the action of the puck is not enough to overcome the tendency to wrap. If I crank the halyard tension way up, I exchange the halyard wrap for vertical luff wrinkles and excessive effort at the furling line.
The Profurl manual goes on and on about correct upper swivel position relative to the wrapstop, but I can't recall anything at all regarding the position of the top of the foil to the halyard exit. Access to the turnbuckle and lower Norseman was higher on my priority list than squeezing every last inch of foil length onto the stay.
It seems to me that a looser double swivel goes a long way to solving this. The operation of the Profurl swivel is akin to pushing a double row of steel bearings around races packed full of overly thick grease... oh, wait, that's just what it is.
This week I'm planning to very grudgingly install a halyard restrainer aloft to alter the lead a few degrees in the hopes that this will help.
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