NHT Placement Help

I am a long standing NHT customer, and find there geometry line (1,5, 2.5, 2.9, 3.3) to be an outstanding value. I am in the design phase of a Home Theater. In the past I use 2.9 speakers and an AudioCenter2 as my front three channels. They were about 8' apart, and I sat 8' away from them (Equilateral method). GREAT two channel sound.
My new theater will have the speakers 11' apart from each other AND I am planning to upgrade to the 3.3 speakers to better fill a larger theater room (Same AudioCenter2).

My question is "How far do you sit from your 3.3 or 2.9 speakers?  Do you find position changes soundstage a little or a TON?

NHT would recommend a listening distance of nearly 16' from the speaker, which is impossible in my design.  
I'm curious as to your thoughts.