Yes, it seems if the set temp and the outside temp are very close, it really goes all wonky.Personally, I think the "auto" climate is broke. It does work well, as you indicate in high temps, and I'm OK with it in low temps as well, but it seems that there's no middle ground for dealing with weather from 60-70's outside. It's either too slow to respond, to fast, and too cold when it does. This is poor programming, or a poorly (more than one?) placed sensor or both. None of my BMW's suffered from this kind of stuff. I actually just keep the system off when it's in the 60's and 70's, otherwise, I have to fidget with it too much.
Interesting, because my wife has a Challenger, and her's works just fine. She sets it at 72 and it stays there. if the cabin gets to 72, it turns the blower off until it needs to adjust a little again.
In my Jeep, if it reaches temp it switches to heat, then back to A/C, and just back and forth. So I just run on LO and manually adjust the fan as needed.