> If removing apps won’t get my phone to better behave, I’m going to do a hard reset. That will downgrade me to iOS 10 (or even 9), which I hope will be more usable.

Not true. Apple's servers are no longer signing iOS 10.3.3, it's impossible to downgrade through any means. http://api.ineal.me/tss/status https://www.macrumors.com/2017/10/04/apple-stops-signing-ios...