The Quatloo gain is insignificant. Bulkfreighters only take 20 people and even a fresh 500 colony will gain 59 in the first turn. The 2500 steel hurts your war or colonisation fleet much more than 20 people hurts a colony.
By distributing the home planet population, I will mean that if you are perceptive you will see that both of our populations are fairly steady at 16mil. I want to know if theres a good way to push this excess to colonies.