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You'll need to back it down when you put larger tires on.

Let's not forget about the coolant controlled intake manifold. All this has been covered in the past(many times). A bit of research may save you a bunch of time and money and effort. I have to ask, what is the goal?

Where is your pyrometer tip?

Go up a hill.

You should not be exceeding 15 lbs of boost. More will definitely over temp. Also, once you think you have it set where you like it, if you load the truck or drive up a big long hill, it will be too high in that case. The fuel rate is load dependent and will vary. 10-12 psi is pretty safe...