Troll trying to get High Pass faction

[ShampooChicken]

I'm seeing a lot of info on the wiki about things I can kill to raise faction with High Pass. How accurate is the faction info there? It says that the orcs/gnolls within High Pass give 2 points, and the highwaymen/gnolls/raiders in Karana give 10. Where do these numbers come from, as I don't know of a way to see the exact raise in game? Or is it just an estimate?

Anyone have an efficient suggestion for High Pass faction that I can do solo as a 22 Troll?