Help with deciding settings on 6-position

[aaron ford]

I will be ordering a 6 position Phoenix around the 21st of Aug. I am trying to figure out what settings to chose.

I saw a previous post that OBS trucks are limited to 65HP tunes. What determines this limit? Oil? Injectors? EGT's?

Also what are the differences between FS, DD, Perf and Tow? I have read that throttle tip in and shift points are changed, but which would way to go in hilly terrain? Low speeds on the hilly twisty one lane to work?
I also tow 7K a few times a year through Appalachia.

1997 F350 4x4, 3.55 gears, Automatic, TDE1

Mods include: Cold Air Intake, New 17 Degree HPOP, 1.00A/R, 3"DP, No Kitty, 140V IDM, EBPV Delete, Full Gauges

Thanks for any help. Don't want to screw this one up.

Aaron