Chris, I would loosen the covering at the wing saddle. Just on the high side. Then sand the wing saddle until the wing is the same as the stab. Then put the covering back down on the wing saddle. Just be sure when you put the fin in place it's 90 degrees to the stab.
It wont take much to get it just right so sand a little at a time.
If you decide to leave it. It shouldn't make much difference. Years ago I built an Ultimate bipe with a twisted tail. I got the fuse off and didn't realize it until it was to late. It flew great. Better than the ULT I have now and it's straight.

David