Jon,
I had a big 2X Parker that had that 45 degree growth underneath. My machinist cut that out to a 90 degree that vise rested even with the bench. This is the after. I cannot find the before photo.
I don't think I could bring myself to machine off that "growth". I think I am going to make a spacer block to put between the vise and the bench top so I won't have to cut my bench.






Thanks for the help.