I have a friend with the same bike, but his has virtually every HRC part you could throw at it and I plan to speak to him today as I think he may have a solution. I'll get back to you when I hear what he has to say.
Well I had a good chat with my mate and he has furnished me with a copy of the HRC Racing Kit manual and talked me through the changes he did to his bike. I'm probably going to do this to mine and see if it helps.
Remove coolant hose that runs from the water pump to the bottom of the thermostat housing and plug ends. You cut down the hoses to about 40mm long and then plug these. HRC supply plugs which are just aluminium solid round bar.
Do the same for the coolant hoses running to and from the fast idle wax unit.
Remove the innards of the fast idle wax unit, as once you've removed the hoses it would never drop the tick over revs!
Remove the thermostat completely. I'm guessing these mods allow the coolant to flow around the cooling system faster and it doesn't have to travel as far.
Downsides are probably the motor will take a bit longer to warm up, but not an issue as this is my track bike and always run it in the pits until up to temp. If it's cold I'll probably have to block the radiator with Gaffa tape to help it get up to temp.
Most of my track days are during the summer and generally pretty hot, so these changes shouldn't be an issue.
Also considering an oil radiator as well. We'll see.
I won't be able to know if all this works until next year, but I'll keep you posted as I go along.
Here's the HRC race manual. If you look at section E-5 you'll see the changes I'm talking about. http://www.risingsuncycles.com/image...05CBR600RR.pdf