Schema, do you use Twitter? If time is an issue, maybe it could be worth making occasional updates there so we can see what you're doing. A daily "first pass on shield balancing today" or "giving new AI a test, take a look (youtube link)" I think it could go a long way.
If you already do this, try publicising it.
Maybe look into having your Twitter posts also be posted to the site. The DayZ forums have a topic called 'Dev Tracker' that automatically posts Twitter and Reddit posts from the DayZ devs. That tends to keep people happy between dev blogs and updates.
http://forums.dayzgame.com/index.php?/forum/138-devtracker/
In fact, having Twitter also update on the forums in beneficial to people who don't use Twitter, such as myself.
Again, it doesn't have to be too frequent - a few times a week would be enough for most. People just like to know what's going on. This is a great community, and people feel invested in the game that the community is centered around. I guess people feel disheartened when they feel that they're being left in the dark - even if that isn't necessarily the case.