Striking a good balance of population will take subtle strokes such as Jinx's idea for different textured ships (I'd love to see a BPA paladin/clydesdale at some point) but at this point the server population may be too low for it work effectively.
We'd need to advertise the server more, the RSI site would probably be the best place at the moment. A lot of traffic from space sim fans should grab us a few RP minded individuals.
As for broader strokes, I really would push for less systems at least in the Houses, having a few empty systems in the borderworlds does add to the feeling of vast emptiness of the galaxy.