Yup, I'm in the exact same boat, my 2013 GT500 with a 3.6KB on E85 tuned by Jr and the car drove like stock, my 2014 GT500 with the Gen3 TVS tuned by someone else from Lund and theres constant issues. I just wish Jr would handle all the GT500s.I will say any time Jr has done my tune everything has gone well. The two times he hasn’t there have been problems. I don’t think it’s a coincidence.