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Can't you time it in a similar manner that a Cummins would be timed? Just set the timing where you want it and not worry about the dynamic timing? You lose variability in the timing but it works for all the p-pumped engines...
There's probably a formula you can use to extrapolate the difference in timing due to the increase in pressure. The best way I can think of is to make a pop tester with multiple pressure outlets. Take your standard injector at 1700 psi and another at 2300 psi and either take a video so you can slow it down and measure the time difference or get someone to help with a stop watch. You might have to increase the pressure differential more to make discerning the difference in time simpler.