Stephen,

Maybe this can help.

If you have a spare autoratchet, then place it to the rear of the upper mainsheet block and have the line wrap around that instead of around the upper block. You will leave one sheave unused on the upper block but it really increases your holding power ALOT. It has to be an autoratchet as it has the disengage for quick sheeting out. The ratchet block can be put on the boom using something like an eyestrap as one block doesn't put too much tension on the light booms we are all using now.

It may not be a perfect setup when the mainsheet setup is twisted but when faced with bad chooses you best go with the least bad.

Good luck !

Wouter