Cool! Well done, you might like to try out the Arkham Nights Cthulhu sometime, a little upgrade but much the same tactics are required. I take it you are randomly selecting investigators? If so I would suggest abandoning that , it can be really hard stuck with Vincent, Pete, Carolyn, Harvey and/or Jenny and finding you can only limp around town as Yigs Doom track goes up like a rocket...
I will have a look at Arkham Nights after I've got a little more experience with the base game AO's.
As for selecting investigators.... At one point I kept playing with the same small group and kind of got into a 'comfort zone' with them that was limiting my understanding of Arkham. Stability is good at first when you're learning the ropes, but it becomes a limitation after a while. So I tried picking completely random teams, but that ended in disaster more often than not. One game against Hastur was an absolute debacle and I haven't picked Sister Mary since.
Recently I've been hand picking two favourite investigators and then randomly selecting two more from the group that I wouldn't normally pick. If I didn't do that they would probably never leave the box.
For the next game against Nyarlathotep I've picked Michael McGlen and Darrell Simmons. The 'random dudds' are Carolyn Fern and Harvey Walters. I've never played Harvey before. He looks like he will be a good spell caster, but with max 3 Speed one of his fixed possessions should be a zimmer frame.