Did you run that C4 with the blower, if so what vacuum modulator did you run.
Im having problems with mine shifting into second way to fast as I would like to wind it out a little more.
Use intake vacumn. Screw is in mod nipple, screw in about 2 turns at a time, will also move 2-3 shif up also. If 2-3 is ok now, you can open the valve body and change the 1-2 spring.