To the OP:
Looks like I'm the only one who thinks this is fixable problem. After all, it's in the manual to shut it down at mid throttle.
So, here's your choice. Do it "by the book". Or slow down the low idle, and let it cool a little longer. Only thing I ask is, if you try my suggestion, come back and tell us if it works.
I'm done on this thread.
