Re DeepFrz comment: From what I see the beam is intact. The island that the post rests on is cracked vertically. And the floor pan, which is non-structural in theory, is stress cracked.
On my Cal 36, which seems to have similar construction and the same type of problem, the port bulkhead is substantially attached to the compression post. On a heavy air port tack everything is happy because the cap shroud
chainplate attaches to the same bulkhead. The beam feels little stress (and the head
door can be opened).
On a heavy air starboard tack things get complicated because the starboard bulkhead is not fixed to the compression post for the doorway forward. I think the designer
figured the hull, stiffened by the beam, would carry the load. In practice FRP is too "rubbery" for this to work well. The hull flexes. The door cannot be opened. The starboard shrouds pull the starboard side of the hull upwards and the doorway skews. Things stress crack. The tabbing breaks. The Cal 40 has a steel
beam down there to help. But that has proved problematic as well.
So how is the port bulkhead attached to the post, and has the tabbing to the deck and hull survived?
I've never really thought my boats problem was a big issue. It is sound. I have replaced the tabbing a few times. She's been sailed very hard, and only slightly less so now. My only visible failure is the upper surface of the step is warped several millimeters downward and the tabbing is moved a bit in the same direction.
Not sure what reefed
should do. Either ponder the forces and bending for a while and come up with a modification. As I wrote earlier, putting the force into the keel may not solve the problem as it gets the force no closer to its destination
at the port chainplate. Or contact a boatbuilder
for a review.
Do you have forward and aft lower shrouds, or just two?