Ok, so one of the major problems with the Yor is slow population growth early game. So the idea is this:
1. Be Benevolent initially, and beeline for the tier III bonus that grants automatic 5 population upon colonization.
2. Build your shipyards with constructors and PLACE YOUR SHIPYARDS SUFFICIENTLY FAR AWAY FROM YOUR COLONIES so that when they build a colony, your colony won't provide any population points to it (key idea! When the shipyards are close your colony automatically provides 0.5 pop at min).
3. Then colonize worlds with your 0 population colony ships. Because of the tier III bonus from Benevolence, your colonies automatically start with 5 pop.
4. Then get Malevolence ideology afterwards for your production bonuses.
With this trick you won't need to assemble population for a long time. 5 pop is decent eary-mid game.
You start benevolent and kind. Then become evil.