I think I get what Brent means, essentially that ventilation alone won't help much, if your outside air is almost saturated, you need to make the boat dryer than the outside air, so other techniques are needed.
I put a little pinesol(pine oil has some good properties) or tea tree oil and spray the bilges occasionally. The interlocking floor tiles make this easy.
Personally I don't understand the use of reflectix in boats, except in small hard to work in areas. it's less efficient and not really cheaper than a good insulation. It does well enough, but not great imo.
Since the job is labor intensive, I'd stick with Volara(for continuous lengths) or Armaflex(available in smaller sheets, or a 200' roll)
which has the added bonus of being mold resistant. Price difference is not huge, online in the usa volara is under 10$ a running foot, and 5' wide half inch thick. Thinner is cheaper still.
Both are acoustic damping as well.
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