Trever,

Interesting charts ... guess the real question is can you hear it?
Now I'm going to have listening to all the speakers at various heights... luckily it's a quick and easy thing to try.

On the inverted install: does that mean you'll put the tweeters 10 degrees above ear level? That sounds interesting. If I do it the other way some surrounds might be blocked by furniture ... on the other hand it reduces the separation between the beds and heights (might be able to move the heights more into the room if I put them in and it's a problem).

P.S. I'll have to try that LARSA module ...