I've built three Tigers, and haven't noticed anything quite that severe. I'd be inclined to wet them down, put them on a flat surface under weight and then build the wing. By the time you're done with the wing, they should be sufficiently dry, and flat, to go ahead and finish the fuse. As MinnFlyer says, it shouldn't be a problem, just make sure things straighten out as you build it out. But if you can take the time to flatten them while you have other areas to work, why not? Just my 2 cents worth.

Tom