Carbon to reinforce Deck

[RELENTLESS 1]

We are experiencing deck flex around the forward bow hatches on our friends Outremer 4X which then leaks washing boat or when we get green water (very rare) over the deck. It is not a 'critical' area and clearly the factory in going light on this racing version built this 'good enough'. However when you stand on it you can flex it a cm or so which means the hatch leaks.

My thought is to buy some Carbon Fiber 90" angle pieces and then either epoxy or use some 5200 underneath the deck at the back and front of the hatch in an attempt to brace the deck against flexing and keep the hatches from leaking.

Any thoughts? It's not cheap but I can buy 90" lengths of 1.5" x 1.5" for $180. I wish I were the craftsman type that could make my own - but the few attempts at hull nick repair on my J80 have convinced me that is not in my gene pool!
Thanks