This has been super helpful, fellas. I see now that I really only have two choices and the idea of using the dome for a reflected reading or dome off for an incident reading just DOESN'T MAKE SENSE! I am not sure why I even thought they were valid choices. I feel much more confident now when I go out and shoot. I will try both and see which result in better lit photos. And of course I'll stick to reflected if I can't get near the subject.

Are there any special situation or caveats I should be aware of, besides the ones mentioned already (ie don't point a reading too much toward the sky)