ehm i'd rather disconnect the whole watercooling to the turbo.
The only thing it does on trackdays. Is that it ads a lot of heat in the cooling system for no good reason. When driving ur car when it's on norm temp. The watercooling to turbo is useless. The oil can coop with it easely.
Just when ur finished, keep the car idling for a while to cool down the whole engine of the exessive heat. Even when the watercooling is plumbed in. (manual switch for the fan could be handy)