AIS? I'm using it for ages, and it creates 0 battery impact (why should it?). Maybe You reffer to advanced-power-monitor, aka APM, from same author? BTW, the latter isn't fatal to battery, too (although, I don't use it since stopped using bq27x00_battery module, due to no additional benefits - it reads from BME, so regular battery applet does same thing, and for detailed info, I have bnf).

As for channel 13, I'm using it for my home network for ages, so it's not the issue. Where I've said about channel 13 instability? It must be misunderstanding, I remember only saying, that on some devices (depending on region used, in this case, EU and similar), without setting 'iw reg set JP', channel 13 works, but is crippled (no higher hop-range).

In any case, even crippled channel shouldn't result in things You're experiencing. BTW, Of course it's up to You, but I also have "main, everyday use" device of very high importance, yet, -devel is enabled 100% time - just be careful what you upgrade (no upgrade for things without changelog/TMO announcement, before checking who pushed higher version and why, as it may be not maintainer)

I know, such view on -devel isn't very popular, but our case is specific. We have plentora of packages with perfectly stable versions stuck in -devel, due to missing maintainers, alck of votes, or problems with repos, or... Summing it up, extras works a little like "legacy support", extras-testing is "old-stable", and -devel is... well, mix of things

/Estel