I don't agree that there is less drag/friction with a single ring. One ring does not support the piston like a dual ring does, and as a result the skirt of the piston makes more contact with the cylinder wall. Don't forget that the ring is an essential heat transfering component in your motor. You will experience a lot more heat on the crown of your piston with only one ring.
You would be surprised to note that a 4-wheeled device transfers a lot more of the engine vibration than a 2-wheeled vehicle.
Look, not to jump on ya here...because I am really just trying to help. But it sounds like you are going off of what you are told, and not what you know. I think it would be best if you called a few of the American companies and see if they can't make you more horsepower for less money. Yeah, I know shipping is a pain in the rear, but I would much rather give my money to USPS international, than TSS (who is insanely overpriced).