I have been scuba diving since 16yo (am 38yo) and have always enjoyed snorkeling. I am comfortable at 30-40ft with my scuba fins, but have lately become more intersted in "free diving". I would like to get some fins and the consensus seems to be esclapez, from my reading, or Cressi-sub. I am 75" tall, 250lbs and consider myself a strong swimmer. I thought perhaps one of the stiffer fins would be better. I'd appreciate any thoughts. Thank-you.