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I haven't experienced the adverse effects of repeated heat cycles either, the FRenault club racers say the current Michelin spec tire is very durable while the one from a couple of years ago would deteriorate quickly.
One can get the Michelins or the Kumhos for about 40 Euros a piece used with about 90% of rubber left, so it would be a rather cheap experiment. I don't know about unforgiving, my 97 tatuus with the Michelin tires is an easy car to drive fast. Sizes for the Michelin FR spec tires are 16/53/13 and 23/57/13. Sizes for the F3 spec tires are 180/550/13 and 240/570/13. The front Kumhos are 10mm wider and the rear ones 20mm wider than the Michelins.
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