Turtle Fin Sizing Question

[Bob S]

I currently use an old pair of Turtle Fins (original XXXL size) with my DUI size 10 Rock Boots/TLS 350 dry suit system. While they work they seem a bit wide. Roomy in the foot pocket. I recently noticed XS now offers the Turtle Fin in a XXL size. My question is would the XXL size be a better option with my size 10 Rock Boots or do I need to stick to the XXXL size? I live in the midwest and there aren't any LDS that carry the XXL size so I am looking for some good advice. Thanks for your reply. Bob S