RE: What goes up.....
I believe you'll never get it straight. The Dumas is a wood boat, you may get it some what straight but I believe it will have a tendency to want to go back to the warped state with a little run time.
In my opinion.....I wouldn't waste time on trying to get it straight. If both the sponsons aren't symetrical it could cause the boat to run undesireable. I could be wrong, just my opinion.