I'm working on a Sig Fazer, and after I finished sheeting the wing LE, one side of the wing ended up with a warp. I'd held the wing down with sandbags while the skin dried.. but....

So now I've used ammonia to dampen the wood with bags holding the wing flat on the table.... not enough. I tried again holding some opposite twist. Ooops, too much, and now the skins are buckling.

What's next?