Coolest coolant for 912iS?

Rotax approves these 10 different coolants for the 912iS. Just curious if anyone has experimented with different coolant types contained on this list and found one that cools any better than the others?

I have only used the Prestone 50//50 DEX-COOL. I used to run into overheating problems when ground idling for more than a few minutes. Then I added WaterWetter and that mostly fixed the problem. Now I will only go into the yellow if I'm holding short of the runway -- in a crosswind - for more than a few minutes. I tested this and found that as long as I have a direct headwind OR a direct tailwind, my coolant temps will be fine no matter how long I ground idle. But if I'm crosswind to the prevailing wind -- such as when holding short of the runway -- for more than a couple minutes, my coolant temps being climbing. In the few occasions where tower has me holding short for a while, I just position parallel to the runway while I'm holding short (I bet some controllers and pilots wonder what the heck I'm doing).

But I'm wondering if perhaps a different coolant from one on Rotax's approved list would provide better cooler/wouldn't get heated up as fast? Anyone tried multiple coolants in their 912 and had a better experience with one than another?