The best thing we are both doing is using dimmable drivers, so if we overshoot on the LEDs we can still dim them enough to get good light. My layout is something I think will work, hope will work, but am not at all sure will work as well as I hope. Yours fits that same category. Until I can get some good PAR data with my layout I can't really guess how good someone else's will be.
I keep thinking I'm almost there, when it comes to being able to figure out how much light a LED layout will give, but adding optics just makes it ten times as difficult to be at all sure. One thing I do know - after I get mine completed and tested I will be better off than now. Then, of course Cree will come up with something so much better that the learning curve will have to start all over again.