ScubaMax 7mm Titanium boots + fin size??

[mark01]

I have a pair of ScubaMax 7mm Titanium boots with hardsoles which fit very nicely into a pair of Turtle fins. Unfortunately, the Turtles and I are not making friends and I would like something closer to my Scubapro Twin Jets in terms of flexibility. The Turtles seems to be too stiff for me. Is there a Twin Jet made in a size comparable to the Turtle fin?? If so, what size would equate?

TIA

Mark