No one outside gybes on a F18. The gap between the forestay and spin pole end is plenty long. Outside gybes are very slow (i.e a distance racing technique) and not efficient in a wire to wire gybe situation.
With my F18 spin sheets, I just tie a figure eight into the clew of the sail at the middle of the spinsheet, then on the tramp, a double fishermans bend to tie the sheet ends together: http://www.animatedknots.com/doublefish ... crollPoint
A luggage tag or similar knot on the clew of the sail becomes very painful to remove after a few hours of sailing. There are fancier ways than knots, but I use them elsewhere in the system (check the team microwind website for more details). Spinsheet and mainsheet I keep bone simple, these are critical release systems that need to work reliably.
As for hanging up on the forestay, the secret is to tape the entire adjuster closed and you can also run a bungee or line from the top of the adjuster forward along the pole. I've found the tape method is simple. You are taping your pins anyway, right?