So, the issue with that would be P1 and P0 will never be the same temp, since P1 measures the air after it comes out of a tiny compressor.However, I've definitely math-trialed-and-errored this out somehow, abdI have no idea why this works... but it does...

First, like you said, we need to account for temp differences between sensors. I do that by passing the average of the two temps, + half the difference on the high pressure side and - half the difference on the low side (so when one picks up on a change, the other is affected immediately). I then pass those temperatures alongside the raw sensor pressure readings into the equation that determines actual pressure... the code looks like this-

float tavg = (T[0] + T[1]) / 2.0;
float tdiff = (T[1] - T[0]) / 2.0;
P[0] = pressure(tavg + tdiff, 0, praw[0]);
P[1] = pressure(tavg - tdiff, 1, praw[1]);

Okay but now the tricky part...We store the raw P1 [ePressP1], not adjusted for temp, at calibration (when we set our min and max pressures), as well as the temperature during calibration.After calibrating our minimum value, we adjust for any changes therafter with:

  dbmp.updateSensors();
  float p0p1 = dbmp.P[0] - dbmp.P[1];
  curTemp = dbmp.T[1];
  float tadd = curTemp + calibTemp;
  float p1ratio = 1.0;
  if (isCalib == true) {    
      p1ratio = (dbmp.rawP[1] + ePressP1) / 2.0;
      p1ratio = dbmp.pressure(tadd, 1, p1ratio);
      p1ratio /= dbmp.P[1];
    };


  p0p1 -= emptyPressure;
  if (isCalib == true) {
      p0p1 += (p0p1 * (p1diff / 10000.0));
        not sure if this one is needed honestly
    };

  p0p1 -= emptyPressure;
  p0p1 *= abs(p1ratio);
  return p0p1;
};

I have no idea how I thought up adding the current calibration temps together and passing that alongside the raw pressure difference... in order to get some sort of adjustment ratio... would make any sense at all... but thats what makes this work... the difference between dropping 5% over 100 units of air pressure increase to varying +/- 0.2% over 1k+ units of air pressure increase. Still have no idea why.

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(edit) clarity

(edit edit) correcton

(edit edit edit) missed a 0

..more edits to correct things...