What he said ^^^
what i do is log: throttle base injection quantity, Main Injection quantity (mm3) & RPM. this is for the LB7, others will be a little different.
while looking at the log and having the tune open it should highlight the cell corresponding to it. mine doesn't correlate properly, so in the log you will see that the throttle mm3 is xx & RPM is xx. now find that in the your tun at the point that the shift occurred (drop in Main Injection quantity).
example: at 2000 RPM and 50% throttle we have 34 mm3. now go to the B1102 Base torque table, at 34 mm3 and 2000 RPMs we get about 293 Nm. checking this in the TLIQ B0741 at 2000 RPM and 293 Nm we get about 32 mm3. this will be between 250 & 375 Nm. i adjust the one closest to the area it falls in and sometimes above, below, left or right of it as needed to smooth it out, firm it up, etc
if anyone finds this wrong feel free to correct it