P2 tow shift points to install in 87 performance

[Cthecountry]

I would like to know what the tow shift point settings are so I can install them to the 87 performance ?
Reason is for my 2003 Gmc 1500 with 5.3 the tow settings on Diablosport Predator 2 cancels out my trucks
Engine Braking.
I need engine braking towing mt 6k trailer to help preventing brake overheating and engine braking
(engine Compression braking) helps to slow down Descending from a hill.
The 87 performance keeps the engine braking but does not have the towing shift points.
Thank you Paul

[06MonteSS]

The shift points are stock settings... they are not changed by the preset canned tunes...