Hello guys I have a simple question, my 2012 mustang gt is dyno tuned by a company and i asked them to lower my rpm shift from 1-2 but they just send me an "open" file were I can adjust it how ever I want .. that's great if I knew what the hell I was doing . So here is my question my car is shifting 1-2 around 2100-2200 rpm which it feel like it takes for ever I want to lower it a little but dont know how to adjust it . Do I do shift press -5 -10-20 -25 ? Or is it +5 +10 ext .