Watching the videos, I am amazed by how much traveler is off of center. The main typically aids as a "backstay" for beach cats with a chute. Accordingly, be sure to have a fair amount of mainsheet tension and a nearly centered traveler. Of course, release the downhaul also or you'll encourage the mast section above the hounds to bend forward, not desirable.
I agree, the main is very much a support for the mast. Letting out the main in a puff can break the mast, depower the chute first. I would also consider adding a wire/line to the top of the mast at the shrouds and stern quarter. That would help keep up with the rotation.
