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0.3 cu ft/min is a pretty extraordinary SAC, even in very benign conditions. I consider myself in the top couple of percentile points when it comes to gas consumption, and on my best, best day I can do 0.38 (according to my Suunto). Someone who can consistently do a full 25% better than that would be a very special (and very small) diver.
Guess you missed my recent post, I'm a 5'10", 180 lb man. My average RMV is 0.37 cf/min based on my last 750 dives. Maybe you are still in the top couple percentile, I wouldn't worry about it. Let me know if you are ever in SE FL, I'd be very happy to dive with you, we'd be pretty well matched.