>but cooled back down to 180 on the taxi back.
There's the clue, Dave.

Sounds similar to my initial taxi test results.
My guess is that you'll cool down once you throttle back on the downwind.
I'd pick a "cool" morning, do a quick runup, then launch before the temps
get too high.
Regards,
John Slade
(The guys at Radio Shack think a "resistor" is someone who wont buy a cell
phone)