That's the nature of stock-ish injector nozzles and a restrictive turbine housing (it would be normal with a stock high pressure oil pump as well, but you've addressed that). These engines do not make any power above 3000 RPM without spending a ton of money on modifications.
We usually leave the stock fuel limiting in place because of these traits.
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Tuning, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years.
Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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