You may have a bad O-ring on the HPR or have a weak HPOP. When the engine warms the oil gets thinner and can sneek past a weak O-ring.
Plug into it with a diagnostic tool or laptop with software and look at the IPC pressure it may be dropping off
2004 Ford F350 6.0L Dualie 273.000 miles with Edge Insight, Early Build 8/03 with 03 engine 20 mpg running empty EGR delete running ELC all stock
1996 Ford F350 7.3L Dualie 343,000 Tony Wildman custom burn,5 inch stacks, good ole girl(in Avatar)
1995 Ford F250 7.3L Regular Cab 255,000 miles Sled Puller