I have a 99 5.3 truck and the factory set d2903 (minimum TCC PWM) is set to 10. From what I have read this should be way higher, like 75-90. Maybe this is an OS issue?
Also, you might notice base pressures are set low. I have adjusted because the shifts were too hard after Trans-Go shift-kit. Maybe there easy an easier way, but it helped alot.