is there really any main differences between the top and bottom rads on the nc30? apart from size obviously? the reason i ask is some of you may have seen my vfr, i have just cleaned and straightened every single fin of the rads and i want to re fit them tomorrow but, when i bought the 600rr top fairing with the air vents it came with all of the air vent parts that go inside the main fairings, i am thinking of aiming the air at the top rad and this would also go towards the air box.

does this sound like it would be of any benefit?

It would not hurt... The botom rad is the key to good cooling though as it is larger and holds more water...