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I don't believe that by pulling off the deck, the foam will dry. The top 2 inches or so might dry but it will still be wet below that. Pulling off the deck would make the foam easier to remove, although i believe it would be harder to actually repour the foam and get it to the correct shape without bowing the deck. I would imagine that i would end up pouring the foam, shaping it and then replacing the deck. Because the boat sits outside in the moist air off the water, I really need to remove the foam, weigh the boat and hopefully refoam all in a single weekend. To get the boat down close to it's 250# i need a target weight of 225# before refoaming assuming my average depth guess is correct for the volume of the foam. I will need to reconfirm once i get back to the boat. I did come across this note on the US Composites web page when talking about the 2# foam.
"This foam is approximately 95-98% closed cell which resists absorbing water, however continuous water submersion can eventually lead to loss of buoyancy over a period of years. "