I screwed the hitchhiker down the length of the senko rather than across its width, so I think it actually holds pretty well as the direction on the pulling force is at 90 degrees to the angle of the hitchhiker. The hair can be as short as you like, I only tied it that long to illustrate it more easily.
Glad you think it has potential, it seems like it should be a better rigging to split rings or sections of straw over the body to re-enforce the hookhold, and hopefullt with a better hooking potential. When the "hair rig" first came out and was used for carp fishing it took a long time to gain acceptance. People couldn't imagine that carp could be reliably hooked by a seperate hook. Nowadays, hair rigs are used for almost every species, it allows for better hooking and the ability to use relatively smaller hooks than would be nessecary if you were hooking the baits directly. Smaller hooks penetrate more easily and catch rates have gone up appreciably since its introduction.