This is definitely the best advice on my specific issues, thank you!
I had hoped this thread would be more about people's experiences with mid-level save-or-stuck spells, and how they felt about them, and how that compared to my experience. But it's sort of turned into a "here's some advice for how to fix specific things you described that sound like problems" advice column, which is... I guess how most of these threads turn out, actually.

Just to be clear: the players aren't a problem, the phones aren't a problem, and being stuck for long periods of time doesn't come up much because I don't put a lot of those monsters in front of them. But I would like to explore that option more, and I was wondering if other people had experienced something similar and how they dealt with it. What I'm hearing is, "you have problems specific to your table" - which is fine, and maybe that's all there is. But can people who are trying to help fix my problems at least confirm that they think the spells are fine as-is? Just so I understand your perspective. Thanks again, all!