[Hydraa]

Okay back from testing. I starting a neutral race with a 100% modifier for happiness. I took a ten planet start.
First turn I built 10 colonly ships. This sent all 10 planets into indifferent status from starting happy.

Then I built 72 troops on a home world.

This homeworld did get happy faster.

Then I went and colonized 10 worlds and got the 9 of the former worlds and built 1 troop on a 2nd world and 72 on a 3rds world.

The original troop world did not get as angry at the colonizing. Also the 2 world to have the 72 troops built did increase happiness faster than the world with 1 troop built. Thus it does appear that multiples troops do increase happiness faster. And I would imaging combined with Urban Pacs or vacation it sould help to hold down the anger.

So from the earlier posted chart you can have happiness/anger level of 0 to 100%. each troop will raise happiness by 0.2%. Most neutral actions or battles will decrease happiness by 2% while a treaty or wat will decrease it by 10%.
There is a max change of +/- 20% for each planet a turn. So it is possible to go happy to unhappy in one turn