David, with that much fuel, you are going to be taking off pretty nose heavy. I moved the turbine in front of the mounting rails for CG reasons and didn't have to add any lead and the batteries were in the stock location. If you use another 12 oz of fuel, maybe put the turbine in the original spot??? That's gonna give you a solid 8-9 minute flight unless you're at full throttle the whole time.
My weight combination had zero weird tendencies. Took off smooth and predictable and was a piece of cake to land. I'll get throws and CG for you this weekend.
Sorry no vids.