Shove those fins up so the trailing edge is close to 14" from the tail block. That loosens it up lots and good for up to around head high, then needs a trailer, or needs the sidefins moved back some.
I like my 14lbs. Bic 7’9" twin in waves around knee to top of shoulders, then gets sketch on bottom turns, so I add a 3, or 4" trailer. I can’t move my side fins more than 1/2", so I don’t bother.