Say Dave,
I've been looking over Steve Fahey's compilation of units and related posts on furling variables. When you have time, would you mind sharing what some of your current spec's are? Such as:
offset
tailboom length & weight
size of tail
I'll be interested in what you observe. At 95% SOC I would think there would not be much load from the bank, so it may behave differently - as you've suggested - under higher loading.
Did you end up springing for the exta string of batteries? I seem to recall you were considering adding a second(?).
Good luck,
~kitestrings