In my honest opinion, it takes a lot effort to try to guess what exactly you are asking. I mean, shorter part of L is already a tad bit confusing (I'm afraid of wasting time and breath by diagnosing a total misunderstanding), but this is even more hazy to me:
What I cant decide on is if I use the length of it all how will it effect my sound being that its wider on one end than the other?
Ok I think I understand this (except what you mean by splitting rooms), but then you lost me again with left front speaker in the corner, because I thought it would have been the right one!?!? Argh. But wait weren't there windows there you didn't want to cover? Argh. I'm already confused, and don't want to try reading a third time, I don't get paid enough.
Just how many windows and doors along the longest wall? (Pics are worth thousands of words).
My instinct it to set the TV up on the extreme right, with viewers facing east. Yes, you may have to deal with light reflections off the display, but it seems to me that cannot be avoided anyway unless of course you might be blocking the windows/doors which you said can't happen?
The reflective energy/balance will be more even between left and right sides. Boundary gain/effect of side surrounds may or may not be more even. Using greatest length as orientation has the benefit of least modal issues for listeners.