does the drop rate knob slow it down at all? Just wondering if the knob worked at all. You could switch the raise and lower knobs to test them. How many cylinders are you running? A third cyliner kit would slow it down and help it lift. The knob should slow it down enough.
the easiest thing to check would be to swap drop rate knobs from raise to lower. Also check the header controller calibration. Make sure it is calibrated corectly. What mode are you using? Manual rtc or float?