How are you getting it to go up? For the most part I've only seen down, it sank like a rock.
I'm not sure how it's supposed to work. I had assumed that control means how much control I have over the region so as I continue clearing stuff out, doing bounties, quests/etc that my control goes up. Maybe I got random events that raised it, not sure. In any case, inside of about 60 days I was at more than 50 control and almost all of the bandits stopped spawning. I was basically left with the rifleman that spawns in watery eyes, the girl with the rifle who spawns in stokke hills, and a freebooter group that spawns right near her. That was pretty much it. The entire rest of the town was mostly empty of anything to fight. So I was paying $1600ish a day for top tier merc salaries and had nobody to fight other than bounties plus arena. Also meant I had no way to train up respect on my slaves.
Oh just saw your other post. Maybe I misread something. Yeah I meant control not corruption. I haven't noticed what's been going on with corruption so far.
I did finally get around to using some doctor's kits and those work great for getting my mercs back up and running after a tough fight. So I'm actually thinking I may just run with 1 or 2 top tiers for a considerable time and keep Bud, Dexter, and Doyle around much longer. If I do a tier 6 I'm pretty much guaranteed to lose Ayden and probably also Felix since the game seems to have decided that he's next in line for tanking duties, but doctors kits fix them back up without stat losses so as long as I actually win the fight it's ok.
I'm not clear on how doctors kits work for the MC since I haven't gotten far enough since I started using them for my MC to be tanking. Ran out of money to buy the health implants. If doctors kits work on MC then it might be interesting to try to minimize merc salaries while still doing the big bounties and just not care if anyone goes down since I can fix them with doctors kits. I'm not willing to take permanent stat losses on a regular basis on my main though so I'm not sure if that means I should skip the health implants so that Ayden remains the main tank.