Repost of what I said in another thread;
The population pressure is far too heavy as-is. It should be lowered greatly.
It was excusable, barely, in GC2 where approval was just a pop growth modifier and the number of people you had on a planet was largely irrelevant to production, but now that population is the determining factor punishing us for having too much so excessively is really pushing it.
I would suggest lowering the malus incurred from having many people on a planet by as much as half. It is far too debilitating.