Aaron,
Oh yeah, I'm really looking forward to the 766. I think back to my initial considerations on electric vs. nitro and I am surprised at the change! I went electric from my N5c because I was concerned with fuel costs with a 700 sized heli, hence the purchase of my E7. But then I acquired the E5 and I absolutely love it...and it's electric, what the heck! Now I'm more stoked about the 766 than I ever was about the N7. I will never get rid on my N5c though and who knows, I might just have to pick up an N7 one day, the heck with fuel costs! Money ain't worth a thing until you spend it, haha!
If I recall recently another team member was having difficulty getting an OS 105 tuned and OS finally gave him a completely new engine and problems were solved. Maybe that is what you need, good luck with that!
Bob