Split fins aren't the solution, proper kicking techniques generally are. That said if anyone wants to buy my used XL twinjets feel free to shoot me a PM.
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Have about 20 dives on twin jet max. Love them. Seem to get me where ever I want to go.
I am a big guy and tried out a pair of Tusa X-Pert Zoom (the black ones with the stiffer compound) for a few months this year, and for most circumstances they worked fine, but I eventually (recently)decided to try some Hollis F1's which I prefer. Needless to say if anyone is looking for a gently used pair of Tusa X-pert Zoom in XL I've got one for sale. The straps have never been used, as I was using springs, but I am going to transfer the springs to my gf's fins.