Ignition coil breaking down

The coil in the distributor on my 1995 k11 1.0 racecar keeps breaking down. I tend to get one days racing out of a distributor before it has a very weak spark. The car still runs smoothly but has no power. My ignition setup is bosch super 4 plugs, standard leads in good condition, full distributors taken of running cars and a rev counter wired from near the plug on the engine. Please help, I've run out of ideas and distributors!
 
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