Hi everyone. I need some info about these fins. Ive been spearfishing for a long time with scuba fins (30 to 50 feet) and I want to go deeper (60 to 80) so I need good fins. I still want to have the benefits of the boots because I dont have a boat so I walk the shoreline. Questions : Are these good, strong? Compare to close heel freediving and to scuba fins what is the difference in thrust ? (example: close heel 100% / riffe open 80% / scuba 50%).