piltdown - there are some people out there that are crazy/lucky enough to not have to worry about licenses (sp?) and aircraft fatigue etc. you get told to go somewhere and so you just go. when you get there and find that it is 10deg hotter than is allowed you certainly dont sit around and wait for it to cool down.
propulike - isnt the temp limit different between the two types? if so then does that mean that it isnt a fuel temp problem? maybe the cooling issues on the older one plays more of a part?