Howie,
I have got exactly the same speaker set up like you. Never mind speaker heights - if you have a normal sofa, that 7200's tweeter's height should be exactly spot on the seating ear height.
If you can, I would suggest moving all 3 to the same line (screen line?) and re-run the calibration and room correction. You will then have the smallest necessary number of DSP operations. Less is more with DSP.
Chenko
Great set up you have there. My 7kVC actually sits behind my screen with the 8ks sort of in line with the screen. If i move my 8ks back I am worried they will be too close to the bookshelf.
howie