There are several ways to clamp an FFG blade in a pre-Gen3 vise. Some use tape or chamois to fill in the gaps at the vise jaws, trying to find a reasonably vertical position. I always clamped the blade with the left face flat against the left jaw. I then canted the right jaw to clamp it flat against the opposite face. This left the blade canted to the left. I’d measure the degree of cant and subtract it from the left angle and add it to the right.
If you can’t measure the degree of cant from the blade, measure the change in the angle of the right jaw. The angle of cant is one-half of this angle change if the right jaw is in fact clamped flat against the right side of the blade.
The Gen 3 vise is designed so that it only clamps with the faces of the blade uniformly displaced from vertical.
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