Looking at the radiator configuration for the 5th gen (assuming 6th is the same), the radiators are essentially a parallel circuit. Water flows into the top of both, or either, radiator and then out the bottom and back to the motor.
So essentially, when the bike is hot and the fan is running, all the water in circulation isn't even passing through the left radiator and the fan. I have to believe that Honda had their reasons for this configuration but curiosity is getting the best of me. Maybe the radiators are too thin and can't handle the full volume of flow?
It would be interesting to remove the upper cross-over tube, route the lower hose from the bottom of the right radiator to the top of the left. Then plug that remaining port at the bottom that was used by the lower cross-over tube.
Thus, all the water would be forced to pass through both radiators in series. I have read lots of discussion about the VTR fan mod for cooling but never a peep about radiators.