I have a remix 69 since i am 6 ft 195-200 lbs. the remix is a front surfing machine. now you might need a little higher and longer wave since the boats are longer. but they that planning hull with enough rocker to keep the bow from diving.
back to the original post. at 5 11 and 150 i would recommend the 59. I think at your weight the 69 will not respond as well as the 59. IMO
why not demo at w.v. where you can paddle the loop. I have no affiliation with WV but i know they sell the remix there.