RE: 31 cc ryobi on a ultra stick
I had a Ryobi & a Homelite on the old style Ultra Stick 120 & moved all the servos for the tail to the rear. I also added a second one for the elevators. 3 total in the tail & thats what it took to balance it. I would venture to say the new Lite version will probably need even more weight back there. Just guessing though.