Hi, Tom,
Everybody was having that problem with the hook coming off, so the Wave halyard now comes with a shackle instead of a hook. We just got two new halyards, and both came with shackles.

I still have my original halyard with the hook. There are at least two ways to solve your problem. Some people tie the hook to the grommet, so even if the hook slips out, it will at least stay with the sail.

What I do is make the halyard continuous. I take the end of the halyard and tie it through the top of the hook (with the knots of my tie-job facing away from the mast). This results in a double-line to tie off on the cleat at the bottom of the mast, but you don't have any excess halyard to store in the pocket.

Racers do not like my system because it creates more windage with the halyard being double on the mast. I don't care because I'm not a very serious racer any more.

It will be nice to get a halyard with a shackle, though.

Maybe somebody else will be able to answer you about the bow hydrofoil blades.