We had the same problem last year with one of the spreader working its way down a little, not as much as yours. Certainly check your spreader screws, we replaced our because of the threads. There was a notice from the factory to replace the spreader screws, but it was some time ago. We replaced the screws and made sure to tie them tightly in place with some thin stainless wire as I recall. Jake mentioned 300 – 400 lbs. In talking with Rick Bliss, he directed me to the NENSA website that has a tuning guide. From this guide we set the mast up according to the big crew setting since we average between 380 and 400 lbs. From memory, so check the tuning guide, with the mast on supports we set the spreader rake to 1.75” and then tighten the outer diamond wires to 500lbs, resulting in 1.5” of pre-bend. There is a note that also says never let the pre-bend be less than 1.25”.

Your post signature says …6.0Ex. Does that mean you have the actual, much talked about and feared “Express”? The first race we did with our 6.0NA with Smyth square-top main and big jib, we were hammered with the Express rating even thought we didn’t carry a spin. Since then we have over come the “Express” fear by comparing the square-top main to the standard class sail. It was noted that the square-top sail was not bigger, but that the sail area was allocated differently. We did not that the jib was about 6% bigger than the standard NA jib. Do you have any other pictures to share? Rick Bliss is a very valuable resource for the 6.0.