You can use a calcuator to bring the large number into a easy to use number.
Think of 15,000 or 22,000 just as 15 or 22 for IPW, for whatever reason DHP does it different or doesn't have "Injector Duty Cycle" has a PID you can log.
The MAX IPW you want to see is 19-20 on stock injectors, you likely hit your highest fuel flow rate at your shift point because the engine is spinning the fastest there. So if you saw 19-20 that is equal to around 90% duty cycle and pretty much out of fuel injector. I've seen people go further like scotty to over 100% duty cycle and still have an engine but that's playing with fire.
Just a few rough examples, at 5800rpm shift with 22 IPW that's over 105% IDC. 6,000 at 22 IPW is 110% and 5800rpm with 20 IPW is around 96.67%.
http://gtsparkplugs.com/Injector_Duty_Cycle.html
