Fishcop,
My feeling is that it is a fuel percolation problem in the Webers, and there are two possible solutions, one temporary, and the other permanent.
First, I am assuming that you have the OEM Bosch rotary fuel pump! If so, when you are about to restart when hot, allow the fuel pump to run for one minute before turning the engine over -- to allow the float bowls to fill back up.
Second, there are 'heat isolators/insulators' available, made of Bakelite plastic that fit between two gaskets immediately below the carbs. You could make some by tracing a gasket pattern onto some (1/4" or 6 mm) plastic, or perhaps Masonite like pegboard is made of. Good luck!
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Warren Hall
1973 911S Targa
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