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What about ScubaPro Gorillas? Crazy thrust. Buoyancy-wise positive, very light.
Also look for Mares Power Plana. I have never seen a pair in person nor seen them for sale where I live. But if they are as comfortable as Quattros and kick like Jet style fins without being as negative as Jets / F1's then they would be my ideal all round fin.
Power Plana - Open Heel - Mares
It sounds like you are going to get a new set of fins, and want to see if there is anything better - for you - than Jets, 20 years later. Makes sense. One question - is / was there anything about your Jets that you DID NOT like? If not, then you probably will be well-served by going that way again. My sense is that Jets have remained popular just because no other fin has come out as a clear, superior, replacement.I used to use a pair of Jets but lost one and well it was time to replace them after 20+ years. . . . Does anyone have a good idea what I can use or should I just go with another pair of Jets?