One trick to eke out more power from a radiator dying plane...
You'll have a minute or so after radiator hit until all coolant is gone. Once you see the temp gauge climbing, its literally seconds until you havea dead engine.
So, before it hits the top temp, hit E to turn engione off. You'll be a glider until the temp drops enough that you can turn on and wep again. Now temp climbs really fast, because you have no coolant except air flow....so when the temp tops out, turn the engine off again.
Yesterday I glided >50 miles with this technique, including getting over a mountain range that woudl have killed me for sure without it. Got down with no kills...but landed square on teh runway!