LSJ-T Injector Flow Rate & Offset

I'm just getting into tuning again, looking at getting my 60p injectors set up properly.

What should offset select be set to, VAC or MAP? Why does it even matter as they are basically two sides of the same coin, correct? or is VAC not the MAP sensor?

I'm also wondering why in the LSJ injector spreadsheet, the numbers don't exactly correspond (e.g. Offset vs Volts vs MAP at 20 kpa & 14 volts is 0.383, but on the Offset vs Volts vs VAC at 18 &24kpa & 14 volts is 0.509 & 0.514 respectively.

And regarding the injector flow rate, why does the table stop at 80 KPA? Shouldn't it go up to 200 like the offset vs Volts vs MAP table? Looks to me like the ECU won't know the proper flow rate when the boost is over 80KPA.

Help me understand! Thanks!