Well, less hesitant isn't the reaction, I was wondering about. If you had known earlier you were the godfather, I would have targetted stevey right away with my vote. The only way the mafia had a chance of winning at that point was for you and the killer to make townie hits, while stevey died. One of those hits had to be the doctor to gain protection power. From there, you protect the killer from the vote and vote for him. You have to hope that the townies will go along with it although, there was a good chance of that since the killer disobeyed them and hit a townie. Nuclearspeed said something about being warned not to go after a townie. Due to the protection, the killer lives and you both put ou a hit on two other townies. This brings you to the last day. A 3 way standoff between a townie, a mafia member and a killer. Anyone's game.
Another method that may have helped would have been to talk to stevey to get some support from him. Have stevey just try and go nuts while you reamina humble and resigned. This might encourage people to switch their votes and whack someone gone wacko. You could also have stevey send a message to someone saying they were hitting them in the night if they don't vote out the killer instead. Make it seem like you are more interested in the killer to get him back since you feel the game is lost. And that might also play into the next day where you would have voted for the killer. In fact, if you had deduced who the doctor was, having stevey send a message saying he was going to hit the doctor may have scared the townies enough to vote for stevey instead. Raise his threat level.
Of course, those plans required stevey's involvement and I don't know if he would have been around to play them out or not. I will say this. Never vote for yourself. If there was any doubt about a person, voting for yourself removes doubt that everything you have accused a person of is correct.
I'm not trying to think if there is anything else I could have done at that point. Nothing really springs to mind now. I guess I would also try to spread any last misinformation I could have to make it seem like stevey was a bigger threat.