I'm in the same boat, would like the mirror to tilt down a bit further.
Unfortunately to get the mirror to tilt down, the selector needs to be switched over to the drivers side. As soon as you switch over to adjust the passenger side mirror, it returns to it's normal position. You can adjust it, but it will stay in that position when you come out of reverse, it doesn't tilt up because you have the selector in the wrong position.
I had a brief look to see if Carly would allow the tilt angle to be adjusted, but it looks like the feature can only be enabled/disabled.
I don't think it can be changed, which is a bit of a pain.
Cheers, Dave