[cripplecreek]

I won’t try to explain the physics of it but it actually makes more sense to me to hang the rocket from its main propulsion source.

I look at it as hanging a baseball bat from the top as opposed to trying to balance it at the bottom. The rotors idea would follow that principle.

[ThunderSleeps]

I've watched some videos from SpaceX, including the Dragon2 roll-out. In there he shows one of the capsule's RCS thrusters. They are very small - wouldn't take much space or weight to put them at the top of the booster. That would give the control system some much needed moment to stabilize the vehicle.