Hypertech shift points w/ 38's

[H2 Doberman]

I searched the forum and found some info on people's shift points but they did not say what size tire that they were running. What are you guys with 38 inch tires setting your shift points at. I have 38x15.50x18 with stock gears. The truck runs fine but like other people have stated, at highway speeds it will shift out of overdrive alot. Anyone have any good advice on the programmer. I have the shift firmness set to 50%. I think I might try 100% and see how that works.