I wrote a rather lengthy answer to this on meta SO that mentions a canonical answer to this question; I'm just linking to it here for reference and additional context.
tl;dr; Just keep promoting and working on the site as you have been, and stop looking at those stats so often.
You just launched into public beta, it's really too early to start analyzing data to the degree that you seem to be doing it. Movement at this point is going to be a little slow, and often seem random.
The next thing we'll be looking for are individuals in your community to serve as pro-tem moderators (is anyone missing there?). The job of a pro-tem moderator goes beyond just handling flags, they're also a liaison between your community and Stack Exchange. They have our ear and can bring us your ideas for promotion, concerns regarding progress and anything else that's needed to help you develop into a successful graduated site.
Addressing your idea specifically, you want to avoid seeding the site just for the sake of having additional content. During the private beta, you did a good job working to ensure that someone with a reverse engineering question would feel welcome and inclined to ask it here. With that said, if anyone has some really useful knowledge to share and no question on the site has provided an opportunity to do so, they should feel absolutely free and encouraged to ask and answer their own question - that's why the user interface supports it.
Right now in addition to Camil's great suggestions, the thing to focus on is making sure that anyone arriving here with a question receives a great answer in a relatively short amount of time. As that happens, you'll begin developing a small but effective evangelical following, bringing even more people to the site to ask their questions. It's important to treat each and every new user as if they might be that user, the evangelist that will bring 15 more quality users to your community.
And please, stop looking at those stats so often ;)