Thermal,
What do you mean by "a very short fuel and pressure lines" to bring down the temp in your engine. I have the same problem. I am just afraid that the bearing in the engine might go again if I run a full tank because by then the engine is reaching 270-280 degrees so I just don't take it there anymore. I quit when it reaches 240-245. But it is terrible b/c I love this thing but don't like to run it in such short runs.