Macgregor 26D deck repair, what fiberglass to use?

[kenfyoozed]

I have a soft spot on my starboard cabin top. The core is gone so I need to replace that. After grinding off all the non skid the deck seems really springy. So I want to strengthen it up. I was thinking of adding two layers of 1708. Since I want to add 2 layers of fiberglass on my deck to strengthen it up, my original plans where to use two layers of 1708. Since the weave is 45+/-, would it be better to have one layer 45+/- and the next 90+/-, or both layers as 45+/-? 1708 and 1208 run 45+/- and 1808 runs 90+/-. So should I run 2 layers of 1708/1208 or run one layer of 1708/1208 and a layer of 1808?