Aligning the TE is more important than getting the counter balances in place because the larger surface areas are aligned.

You could take things a bit further and now de-align the warped half to sort of average things out to a SMALL degree.

Usually getting a much warping as you can out, then aligning the trailing edges will improve things greatly.

If you want to fully fix the problem you can try the following.

- Cut the elevators back out

- Remove the covering, wet the wood, set the elevator on a perfectly level surface with a larger level weight ( I use UPS batteries) , and let it sit for a couple of weeks to dry, recover.

- Or inject small amounts of water under the existing covering with a syringe then do the above but wait even longer for the wood to dry..

- Removing warping with a heat gun is a bit iffy. Different covering reacts in different ways (e.g. some expands then contracts, some contracts only, some loosens ), and you may end up introducing more warping, though initially it may seem that you are improving matters.