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It's difficult for me to explain, but I'll try:
The trick is to fill the "CAL"-row with numbers to increase or decrease the slope of the new maf curve. It does not need to exactly match the pre-calibrated maf curve - so if there are "hills" and "valleys", you just try to adjust the new curve to go through the middle of it, with the least possible amount of corrections in the CAL-row.
The ECU will compensate with STFT+LTFT in these regions.
No reason to freak out about fuel-trims.
Just the area around 3V should be treated with care, we don't want much interfering from the ECU here, because the final fuel trim throws off the open-loop scale.
edit: I try to get around +/- 0.5% difference to the vgitool-calibrated data here (coloured "red" in the spreadsheet).
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