I'm done. If I could delete the thread I would. It's not going anywhere.
Huh? Don't leave us hanging; did you try adjusting the reverse tilt to your desired spot for these trouble back-in/parallel spots, save it (one time only), and try it out?
As for the buttons not working--call your local Service Center, IMHO. I rarely adjust mine, but don't remember any trouble, but I almost never adjust them, so they may have been finicky and I just don't recall. I don't even remember how the buttons work; you mentioned looking down at the red light, but can't you just press the left one a couple of times (I know, I know--once should do it! sounds like a bug) and then start manipulating it?
(That said, I'm hoping you try setting a custom auto-tilt and see if it works, now that you know that it's not a one-size-fits-all setting.)
Anyway, good luck!