I think the issue is to many people who have this machine the screen tilt is fine or normal. In the last five years I've had three MBAs and my wife has had one MBA. I just compared the rMB to my 11" MBA and to my wife's 13" MBA. The tilt is the same.
So, my question is what laptop are you basing your assumption that the tilt isn't enough? I understand you may want the tilt to be more, but from all the posts here I have yet to see one showing a laptop with more of a tilt (especially from Apple).
I also find it humorous people who are posting on this board who don't even own a rMB or have any interest.