Skuzzy, this confuses me.
I tried doing some stuff plugged into a 1080i TV set (laptops, etc) and ran into this same problem. I haven't tried it with AH, but in general why doesn't it work properly?
If designed from the ground up to run at 1900x1080 pixel resolution, why when you give it a 1900x1080 signal to display does it reduce the overall quality? Isn't this how it was intended to work?
I confess ignorance other than seeing how it worked trying to run a laptop via my hidef TV.