I would say you’re at 5.5” of lift. Any other mods to the front axle or mounts?
I ask because at that height I’d expect your caster reading to be a bit lower. And that height is higher than what my caster plates can compensate for and still be with the factory specs
How did you determine that you are at 6” of lift? It looks like 4” to me and your caster numbers support that.
My plates correct for 7 degrees so if your Dobinson plates are indeed 5 degrees my plates would add 2 degrees to what you have.