Henry, this is how I set up my PetersonHd tuner.
GFI Ultra bedecked with new, stretched in, SIT nickels, from our very own JD.
First, I tuned to the supplied Emmons E9 presets. Then I went, line in, to my computer, running Reaper and going through the Reatune plug in. Simultaneously, I was monitoring through my amp.
Using the notes that were set at zero, the E and B s as a starting point. I went through the various pedal and lever configurations, tweaking till they sounded okay to these jaded lugs. Once I was happy I noted down the various tuning readouts from Reatune for each string, open and shifted.
Armed with this info, I went on to the Peterson site and created my own custom sweetening, then loaded this into my tuner.
It was a long haul, with coffee breaks and pauses spent watching the starlings shitting on my Kia Rio, but it was a one time deal and now I'm almost in harmony with the universe.

GFI Ultra keyless S10 4+5 Emmon's setup + Sigler, Li'l Izzy, Hilton volume pedal, Roland Cube 80gx, Joyo American Sound Pre-amp, Behringer VD400 Delay Pedal, Peterson Strobo Plus HD and a brace of bars, Ben's, Ezzee-Slide, Pearse, BJS, SIT nickel strings.