The only 'problem' with mounting the head down (or so I've read) is the possibility of fouling the plug faster. Putting some rocks in the starbord side may help, it may give you a good idea of whether you are on the right track. Keep in mind, the rocks will be a constant force, where the engine torque varies. This is why I suggested flaps(much like roll control with an airplane); with flaps in the propwash, the higher the RPMs, the more force the flaps exert(to counter the engine torque). Probably, a combination of balance and flaps will do best. Otherwise, let the experimentation begin! Good luck! Sean