It would seem you are correct, that no one here has seen this problem. I've sailed Oday daysailors, Soling 27's, Seafarer 22's, J24's, Olsen 25's, C&C 30's, J30's, C&C 40's, S&S 46 one off's, and never encountered it. I would recommend having a professional rigger look at it. You are not going to compress the deck, as the boat has a compression post from the deck to the keel. But your concern that you might makes me think your tension may be too tight, and you may be straining the chainplates. I suspect your tuning is not quite right. Too loose? Too tight? I can't say. Getting professional help is a small price to pay to solve this kind of problem.