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Try removing the seal between the bonnet and scuttle panel. That's a low pressure area and the speed of the air moving over the top of the windscreen might be enough to create a slight suction to help pull hot air out.
Have you monitored coolant and oil temps to see how hot it's actually getting?
If it's just track sessions at 20 minutes a time, they're not really needed.
Maybe look at what @Tomotek has done on his race car. They need to be in a low pressure area for them to work, can't just slap them anywhere.
The Pure Motorsport stud kit goes rusty eventually too, but i've give mine a wipe over with acf50 and they stay black.
I suggest you do that on your next set Dan.
Just get 2 gallons of dionised water mate and use that as coolant for the Ring trip.
If it leaks then it won't be an issue.
A lot of the regulars there do that.