By itemization, I meant a list of actions and scores that add up to infamy. I had an infamy score but am not sure what I did to deserve it. Maybe I am misreading the score. I think it was -170 or so. I thought I had been a paragon of justice.
For the friendly AC, maybe I'm thinking according to my play style. Intel leads me to the body pretty quickly. After that, I feel the obligation to help the brother's crew. They're alive, after all. But the long drive back to the body and then the boat can be a bit tedious. The additional boats should help some, but didn't this last playthrough. I figured a little plot development and some subtle changes would freshen things for the drive back. It could make the ending a bit more hopeful, though maybe not the theme you're going for.
By the way, once the body is found, intel and conversations with locals become irrelevant. Some variety here, maybe? They know where a vehicle is, or can sell you a rifle?