I finally got my integra 80.3 set up and calibrated with 8 positions last night. I am also running 9.1 for the first time with all speakers angled properly. I am running the extra wide and heights.
All I can say is that I am very underwhelmed by the experience. I found that it did not add anything extra to the immersion i was getting with regular 5.1.
If anything, it robbed the receiver of more power as I found I was turning up the volume higher than normal.
I believe that if your speakers are good quality, adding the extra speakers is not worthwhile and does tax the power supply more.
Heights and wides are really just a preference thing, as there is no agreed standard for them, nor indeed any content specifically mixed for them (with the exception of Expendables 2, allegedly). Some people will like the effect, others, like you, won't.