Every newer truck with tow haul, including a 5.0 F150 6 speed will take the engine up to or near redline when it downshifts in a grade braking scenario.
The question is what is your perception or definition of really high and downshifts hard?
Truck is 6 years old, so is this a new condition or new to you truck, or something you just noticed?
And fwiw, engine stress at any rpm in this scenario are far less than full throttle under load at the same rpm’s, which the engine is obviously designed for, so no worry about the engine.
Trans is also designed for high rpm downshifts in the same conditions.
2016 Ram 2500, MotorOps.ca EFIlive tuned, 5” turbo back, 6" lift on 37s
2017 Heartland Torque T29 - Sold.
Couple of Arctic Fox TCs - Sold