I have a SEIKO SKA413 (BFK) that I bought a couple of years ago. My first SEIKO diver. The design really clicked with me, as well as the solid but smooth and comfortable rubber strap.
But I really haven't worn it much. I recently had to rescue it out of a completely flat battery. Having a kinetic you don't wear much isn't all that great an idea... but I figured out how to use a make-shift charger and got it back up to full.
Anyway, I wore it a bit after recharging and started to remember why I hadn't been wearing it much. My 7.5" wrist is generally large enough to handle larger sized watches. But there's something about this BFK that causes it to rotate on my wrist. If I strap it on tight, it's not comfortable. One notch wider and it's comfortable without being what I'd call excessively loose. And yet... after a bit of wearing, the watch rotates off to the side. I don't know if it's something to do with the nature of the strap design, the shape of the case, or how both rest on my wrist.
So is this a somewhat common occurrence with these large, heavy watches? Or does it all depend upon your wrist symmetry?