I've seen people get away with standard servos and only 2/56 rods on the Do,however they covered the hinge gaps and used strict throttle management,no full open when level,only for up-lines. I dont recommend or use such light gear but it can work if you are carefull. The people I'm refering to are top flyers(hovering 40%'ers & tail touching),I think they went with the lightest gear for weight savings.