When I built my 14, my trim tab came out with a twist even greater than yours. I decided to live with it and build on (perfection is the enemy of completion) and see how many other major goofs I might make. I found my skills improved quickly, and I was much more careful (less cavalier) with flaps and ailerons because of this “error”. Before first flight, I built a new trim tab with little difficulty that was excellent.
My trick was to use the granite countertop in the kitchen (all the clecos on one side of the tab with just the very trailing edge over the edge of the counter, check and recheck and recheck as riveting progressed with bracketing rivets - every tenth, then every fifth between, etc. The 14 method with double sided adhesive “tape” to hold alignment worked well for me.