I repot anytime, although have never tried it when one's in bloom. Your mix sounds fine to me, although I don't grow that way. Because they like moist feet, you just about need to repot once a year if using an organic mix.
Have read the warm growing multi-florals are supposed to be repotted during warmer weather due to slower growth in winter months. But I've never paid much attention to that.
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Caveat: Everything suggested is based on my environment and culture. Please adjust accordingly.
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