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Well first off, let me say, I could have messed up on the math.
http://www.coticule.be/wedges.html?file=tl_files/barts_pics/Bevel_angle_calculation.xls
Is a good resource.

Well I am not a builder. I have done a fair amount of honing. At this point my first guess is that you angle is too low, due to the ratio of spine to width. Try building up your spine with three...