Hi!
I'd be interested to read what you find out Iztok
OFC you'll do!

That's the point of community. With this game I feel a seriuous lack of numbers. Being a long-time and successfull Stars! number-cruncher I need them here too!!!

It seems the pop/taxes/morale are the main factor in success now more than ever
Very true. Without good economy it's really hard to get anything else.
and I can't seem to get a hand on it when every civ in my game is relentlessly attacking me pretty early on in the game.
Huh? How's that? In my games I'm usually the one that starts attacking others, and I'm playing well above normal. Do you have good diplomacy (a + in relations)? If not, consider building Diplo Translators. Do you have a trade route to your every neighbour (a + or ++ in relations)? Do you have fake defenders (a cargo ship in orbit with tree cheapest attack-1 weapons, that shows 3 * attack 2)? All that helps to get your neighbours off your throat, and going for somebody else, so you're free to develop in peace until you're ready.
Getting my population to grow has been challenging and their morale stays pretty shitty, even running at a 28% tax rate
I find playing Drengin in the campaign really easy. They have an inherent 25% morale bonus. With 1 point spent for additional 10% helps me running my empire in expansion phase at ~47% tax while still having 100% morale on ALL planets. Holding the pop at 100% approval doubles the growth, that is already boosted by 25% bonus from 3 race builder points and 10% from first very cheap tech (medicine?), so I have at the end of the first year twice the population of the second greatest empire. If I'd tax them to 65% (just to have them all above 40% approval to stil have the base growth), I could get more money I'd be able to spend with my low-productive infrastructure. But in most missions I didn't need to do that, they proceded quite slowly compared to my previous games. Probably because the main AI bully Dregin was not present.

BR, Iztok