What type of finning do you do, flutter or frog? I have size 15 also, I’m leg heavy too, 6’5” 245, the choices are limited but more than necessary. How do you travel to dive or is it local?
A great overall fin is Sherwood Tritons, they seem floppy but really move you through the water and turn in a decent frog kick, scubapro sealing Nova is also a good all around especially in the gorilla version.
XXL eddy fins are my least favorite because the foot pocket is just to damn big and the fins are a bit floppy, they work ok but for floppy I’ll choose the triton every time. I do use XL Eddy’s wet and dry, 3mm booties wet and dry I have 3mm compressed feet, thin wool socks with lava core socks or 3mm socks with 5mm booties over those, the sole on the outer booties have to be minimal to work. All Eddy’s come with spring straps that will likely be to short for you. If you can find F2 springs those will work fine or make some bungee straps to replace the spring, fins don’t have to be overly tight and the bungee is the only way I can use the Eddy in warm water and thin boots.
For warm water travel friendly fins try scubapro GO fin, truly the best warm water fin I have ever tried (I have two pair of Accell’s available if anyone wants them)
The GO is a sock or barefoot only fin but they will come out with a regular foot pocket version soon, I will try those out as soon as I get a chance.
These are just some suggestions based on similarities, you have to try different things to see what suits you.