There should be trim codes on the injectors (6-digit, IIRC) which I recall reading should be flashed into the ECM to tell it what it’s doing. Cummins has like a 2% flow rate tolerance so it seems to me the purpose of the trim codes is to tell the computer how to adjust individual injector signals to ensure equal cylinder contribution. It might be worth a call to an injector shop or a retailer who deals with a bunch of these. Geno’s has an excellent tech line, and several of the folks from @DDP Motorsports
are very active on here if you reach out. I’ve spoken to and dealt with them several times; if they don’t know the answer, they’ll point you at someone who does.
Hope this helps. Good luck!