I'd add in technology that expands the natural lives of your guys as well. Biology needs more useful tech imo.
The problem with this is that it does not have to lead to higher population growth at all except some spike in total population. Population growth is a very complex issue in real life.
It should probably stay as a limiting factor to be one encouraging factor to spread out your population in many small places.
Ok, but I dont know what that has to do with having tech that increases the lifespan of leaders to make biology better.
You could add a bunch if healthcare techs, like one to keep leaders from developing health issues, or another to booster the base characteristics of leaders with gene therapy. Mabye even the ability to make clones for your army.