I redid all if mine. Removed the stanchions (labelled first!). Used a dremel router bit to remove some of the core, leaving the screw holes in the fiberglass "skin" untouched. Filled with epoxy. Redrilled the holes, bedded the stanchions using butyl tape.
So far, no leaks; but I did have to go around and re-tighten the screws after around 6 months, once things settled.
The most time consuming part was getting around to doing the work! The P323 has great access, so it was fairly quick and straightforward.