You can also look at idle fuel trims for each injector in datalogger, will read as a percentage from -20% to 20%. If you see a negative number, cylinder is over fueling or contributing more than the others. A positive number is the opposite, under fueling or not contributing properly. Beware of this as the numbers may identify another cylinder as a problem than the correct cylinder. For instance, it may show 20% on #8, but the cylinder before it in the firing order may be the problem (making up for it).
Another way you can check, ramp up FRP at idle while checking power balance, sometimes helps to identify a suspect injector.