DOWNHAUL, DOWNHAUL, DOWNHAUL... Get a 16:1.

That is the only way to sail the MX with underweight crew. We own an MX, and my wife and I tip the scales at 270 combined. She is not so experienced, but knows how to hold on when the going gets rough. I would say I am pretty experienced in heavy air.

We have successfully taken a 25+kt beating for a sustained 30-45mins while going to weather during the last Bandit Run. The main was inverted for most of the time, but never were we in danger of a capsize. Just strap everything so you essentially have two blades aloft. Oh, and one more thing, trap till it burns.