4450 pound car swapped 2002 5.3l, 706 heads, cam specs 225/231@50 276/289@06 .537/.517 lift 110lsa, tbss intake, fast 92mm tb, short headers, 4l60e 2000rpm converter, 3.43 gears 28" tires. I know the converter is too tight. I intend on replacing it this winter. I want to enjoy my car for the rest of the summer, I have been playing with the tune for a few days driving. car seems extra slow, like 15.9 at 91mph slow. cant do a break stand slow. anyway to fix this