Post the clip on youtube and ask some freedivers to check it out for you. I am about your weight and a little taller, and the C4 25s or 80s are about right for me. 30s are too stiff, 40s way too stiff. Not saying I have great bifin technique, just that the soft fins are definitely capable of taking you very deep and they'll probably be more efficient. It may just be you're bending your knees a bit too much
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