I believe most teachers would advise high handicappers to stay away from that much loft. Hank Haney, for example, doesn't even like high handicappers to use 60° wedges.
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I agree with this. I consider myself pretty decent with a wedge, especially chipping. But a 64* (and even 60* to some degree) takes too much practice to make it effective. I would go no higher than 58*, maybe even 56*.