Ok, I am 5’11" and i weigh 138 lbs. I want to know what CI single fin board would be better for me, the 5’9" or the 6’1". I feel like 6’1" might be a little big since my normal shortboard is 6’0". But i don’t know how your supposed to ride the CI single fins. I am leaning towards the 5’9", but any help would be great!