What I'm hearing you say is that if I use "fixed size" then the UI will not stretch to match to size the device screen height. Given this then the UI should match any device regardless of that devices screen size. Correct?
I think my problem is the aspect ration setting in Unity. When I use 320x480 portrait, which is the device screen size, the UI gets stretched in the Y-Axis, but when I use 600x1024 the UI is not stretched as much (it's almost the correct size.). I thought that screen resolution and aspect ratio where one and the same, but I guess they are not. Correct?
I'll try publishing with the 600x1024 portrait setting and see what happens.
Thanks for your help.