Weird. I hate to say it, but if the mast compression forces squash the deck, the crown would flatten, the deck would become wider, forcing the hull out at that point, taking the bulkead with it. This would be obvious, though. Anybody in a dinghy could see that the freeboard wasn't fair. Have you looked? So far, mine does not seem to be doing this, but other B32's have. Check out
S/V Kestrel Some where in that site you can see where he reinforced his cabin top. I set my rig up a litttle loose. That mast is a tough looking extrusion, extremely well stayed. I figure a little slop side to side is okay (I'm not racing). I hope this is not the case with you. All I can say is that my forepeak door closes okay, and I don't seem to have much movement around the compression post. (1/4", tops.) Let me know if you want some digital photos sent your way. I'm away on business, but I should be able to send them late next weekend, if this @%$^& rain ever stops.
Mainebristol SV Eider, B32