: When i slide the forms in place, they fit so snug that they pull
: the sides flat between forms rather than letting the sides keep
: their existing curvature. Should i shift the form spacings or
: maybe sand down the sides of the forms? Or does in not matter
: and everything will work itself out later when i attach the deck
: and hull?

I take this to mean that you are inserting the forms into the plywood hull that you have already constructed. You are preparing to strip the deck on the forms. I have never built a hybrid so can't comment.