I'd like to see your weak spring at WOT pull a trailer up a hill at 1700rpm vs the stuffer spring. Then your egts would call you out.
That's just plain silly, do you not have gears? Lugging a diesel with heavy loads up a hill is a very bad idea. You should change gears to get your RPM up, your EGT will then improve. Short shifting diesels and not utilising the full RPM range is severely limiting your engines ability.
I have zero issues pulling full torque up hills and my tune is exactly what I want to be nice and safe.
Pick one son.