We've had great luck with the Specialized Captain cyclocross clincher run tubeless on different rims, and I'm not sure it was 2bliss ready. I think part of the problem might be the narrow Mavic Open Pro rim - definitely not a conversion favorite around here. At your weight, 40 psi doesn't sound that high, depending on course and riding style.
But you might try a different tire. The Specialized tires aren't that tight...and thus we've had luck mostly on the Stans 29er rims. Maybe give a carbon bead Hutchinson or another tire a try?
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