I don't really understand want you want to do, maybe comparison to quick load is your aim?
What model are you referring to?
Anyway, I have a Pressure Trace II, the numbers it supplies are absolute pressure, no fudge factors or subtracting a form factor for discrepency to reference ammo.
I tried the factory ammo comparison, but found it was well down from SAAMI spec in all rifles tested.
These days when I start testing a new bullet/powder combo, I just test for pressure and whatever it spits out I accept as being whatever. I load one round for each powder weight and test.
I don't average anything out, just shoot and what is, is.