The Optoma's Contrast and Brightness settings were essentially dead on, +/- 1 of the defaults.
Last topic. If you look closely into the dark areas of an image, you will find some noise. This is typical of DLP projectors as compared to LCD models. The noise levels on the HD73 are very typical of DLP projectors, and I have not found the noise to be an issue. Running the Silicon Optix HQV test disk, the HD73 performed very well overall, with passing grades on all noise and jaggie tests.
That raps up this section. As you have read, there are some issues, mostly ergonomic ones, with the HD72. If none of them is a problem for your particular installation, the HD72 should be at or near the top of your short list.