Quick thing that might be an issue, with Diable they seem to start off suspicious towards you, and they never seem to post missions that you can do for them. This makes it very difficult to win them over as a faction because you basically have to wait for a random bounty to pop up(usually on luddic path) and grind out those guys in the hopes to get them favorable towards you. I think they should at least start off neutral towards you, or at the very least have more mission available to the player so that being suspicious isn't as much of a hassle.