CNG, your update cycles are actually better than most devs. A lot better. Plus your communication and status updates are top-notch. Really, you should be an example for 99% of other devs out there. You are honest and straight with all your fans, always.
I think shooting for updates every other month, or max every 3 months is ideal for most AVN devs, but your release cycle is pretty great already, as I mentioned. Plus each update has lots of content. If you just want to change it to get more eyes on the game, then I think every other month is ideal. Once per month is probably too short. Then people will be complaining about the 10 minute update.