Is the outer wing piece too thin/thick – in other words, is there little or no height difference on the other (bottom) side of the wing. Or, did you glue it on a little off center?
Either way, if simply filling doesn’t satisfy you, then pop that baby in the freezer and hope it snaps off clean because you might have to re-attach.
If the wing piece is too thin, then you can either try to pop the pieces apart and shim/shave it to fix the fit issue or you can cut your losses and have the height difference on the bottom where it’s less noticeable.
Frankly, the latter options scare me.
If it was me, I’d probably end up doing more damage by trying to fix it this way. (I’ve been known to do that on more than one occasion)
Anyone else have any suggestions?