No boost at 1900 RPM, 4th gear, and 3.55 gears while pulling. I must be missing something. I have an 85, 6.9, 1st gen banks, 3.55s, zf, psd intercooler and make about 1 lbs boost empty. Pulling my tractor and trailer (9000 lbs) I get at least 3-4 lbs. These boost numbers are all on flat...