"I'm very happy with the adjustments made so far but I will continue to experiment. Do you who are familiar with its operation suggest that I by the setup microphone?"
I never used the microphone, but given your issue, you're probably going to have to do everything by ear. As far as ease of use goes, the main thing is to focus on the menus. If you think about what's going on, everything seems to flow in an orderly direction. I'm somewhat of a minimalist, myself, so when I first started using my EQ, I thought it was going to be a nightmare. I hate having to figure out how to use complicated devices like that, but its really not too bad if you give it some time.
"Anyway, earlier in this thread I stated that I preferred the parametric EQ for control but liked the simplicity of the graphic units. How could it be any better, then, to have the capabilities of both; this thing is almost magical. I especially like the fact that along with the graph display there is also a numerical display presented in 0.5 dB increments."
I suspected as much. I started with the graphic myself, but experimented with the parametric and quickly found that I preferred it. Its a very powerful tool. You'll definitely want to learn how to save presets. They save so much time, and allow for such easy comparisons, that its probably the most useful feature the EQ has.
I may be getting ahead, but with this EQ being digital, it allows you to keep a high end sound without spending a lot of money. You don't have to use the built in dac. You can keep the signal digital and send it to a re-clocker or standalone dac. You shouldn't have to take much of a performance hit, if any, with options like this available.