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You're just speculating here. Hotlights are not recommended but a 250 watt modeling light with the Kacey dish is fine, according to the designer. And plastic doesn't absorb heat like metal so it won't get as hot as a Mola would.
That's not entirely accurate. Metal will dissipate hate and keep the lights running cooler than plastic will. Since the plastic is not as conductive as metal it will generate more heat inside the dish and consequently the flash itself.
Again, I've never had a problem with the einstein but I don't run the modeling lights at full power with my kacey dish.