If there was a direct way to influence pop growth, every France player would enact it right away from 1836 (or as early as possible) onwards. I think it was silly that health care influenced population growth so directly in Vic1... it should not be that way in Vic2.
France was a really wealthy country with high education and stable society throughout the Vic period, so there really wasn't anything "lacking" that kept the French from breeding more. If anything, the game would be more interesting if POP growth was higher for less rich and less stable societies! That would make for more fun game choices...
"I could abolish education for girls and get that +0.05 pop growth modifier to out-breed the Prussians..."
"Do I really want all my people to become affluent high-CON bourgeois? If my people keep getting richer, I will lose those precious 1.8% pop growth per year!"
"If I let the Reactionaries win the civil war and switch my national value from "Liberty" to "Order", I will lose research and wealth bonuses... but I will gain additional +0.25% pop growth, and those ethnic minorities will stop complaining about civil rights... it might be worth it."