Hi. Sorry for my extremely late answer.
I'm not sure exactly. It's a bit hard to explain. I would say that an option to just slow down the speed a bit. I think my problem is that during the mid game your population and resources get full a bit too quick so it feels like you have to build nurseries and storage faster to keep up with the supply. I think this feelings are due to the history of resource managing games. As you wrote below; people aren't primed for a more relaxed gameplay. In traditional games the mentality is that if you can't store resources you are losing resources instead of thinking about is as a positive when you have full storage. It's kind of a glass half full (Hivetime) vs half empty (others). So a part of the problem is the genre in itself.
P.S. Have you considered localizing the game. Way back in the days I was part of the subtitle translation community where I both created new Swedish/English subtitles and translated English and Swedish ones. So if y'all are interested I would love to localize the game. There's not a lot of text so it wouldn't be that much of a hassle for me.
Thank you again for the great game.