Just did some number crunching on a WW (sorry the geek in me has his moments
)...
Sharpening across the flats gives you a cutting edge of 60 degrees, which i think everyone knows.
Across the flats is not square to the edge, the cutting edge square onto each blade is about 61.1 degrees.
But the WW isn't going to used with the blades square on (or across the flats), they are used going point in first with everything that it hits encountering the blade at a 12 degree angle.
That 12 degree approach to the cutting edge gives the cutting edge an effective cutting angle of 14 degrees.
If you sharpened an edge to 14 degrees on the square the edge wouldn't stay sharp very long as it has no support, but the WW has a 61.1 degree edge on the square giving it a lot of support to keep that 14 degree effective cutting edge.
IMHO, stop trying to shave with it. Get the 60 degrees across the flats polished up real nice and leave the design do it's job.