Power loss under load at higher RPM is usually attributed to a couple of things:
Insufficient fuel quantity.
Insufficient exhaust flow.
Misfiring cylinders.
Airflow restriction.
Programming also plays a part in it, but since you're now running the programmer, the torque reduction per RPM should be nullified.
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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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