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Yes, you won't get good results at lower pressures with a linear equation because the ICP pressure-to-voltage curve it not terribly linear down there.
The PCM can handle it because it is put in the form of a map - like everything in a PCM.
You could piecewise-linearize it for Torque by breaking the curve into two regions. ...but you'll still have deviations - particularly at the intersection.
2004 F550 CC Lariat
BPD oil cooler relocation and upgraded EGR cooler (spooled), BPD oil bypass filtration, aFe Magnum Force CAI, Mishi radiator, 7.3L fan clutch, EC1 ELC, XDP coolant bypass filtration, '08 trans pan/filter, PTP direct clutch solenoid, blue spring, 6.4 starter, MBRP y-pipe, BD boots/clamps, '05 intake elbow, ccv reroute, Torque Pro + OBDLink™ LX, Autometer EGT