MisIry does not use fractions of losers. This hand has 4 losers, simple as that. The auction would go:
2NT-(perhaps a double which has no effect at all)-3C
3H-4H
3H shows 5-5 in the majors and exactly 4 losers. Responder has an easy 4H call. The only disadvantage that I can think of is that the opponents will be so impressed with the auction that they are unlikely to double

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