S14 was a restricted class and not as fast as Mono2 was at the time despite the extra 2 cells. I Don't know the boat as I was on a break from racing when it was out, but it may well have been designed with some rocker from the factory to get the nose up on the limited power they came with. Put the hull on a flat surface and if it curves upwards at the stern, that is rocker, and making it go faster than its design speed will always result in porposing.
You could try fairing it flat with filler, or what we did to race RTRs with rocker is cut off the transom just before the rocker starts, cut the now separate transom off about 5mm forward of the transom, turn the transom around and glue it inside the new back of the hull, creating shorter hull with a new transom with a sharp 180 degree edge and no rocker.
Paul Upton-Taylor, Greased Weasel Racing.
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