Dave
You are my hero for singlehanding that beast. Wow.

I think most of us get the constant leech pressure idea. My Acat has a curved travelor that accomplishes the same thing, but with much more simplicity. The clew of the sail is attached to the mainsheet via a loop and none of the leech tension is transfered to the boom. The outhaul is attached to the clew, so the compression forces on the boom are minimalized.

N6.0 does this will a free floating car under the sail on a loose footed sail.

I think the issue you need to solve first is lining up your clew with the travelor so that the force is 100% downward. This will relieve pressure on your boom. From the pics you posted it doesnt look like the clew and the travelor are lined up. Recutting the sail might work. Or moving the travlor, or both.

Bill