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Anon.....Your confusion relates to the fact that the angle
of the bottom of the legs is actually the INVERSE of the 60*
As Abe stated, laying the leg on the floor and marking the
angle at 60* (using the floor as the base of the angle)
will, in reality, give you a 30* angle on the legs when
you pick them up and stand them as 'legs'.
As you are measuring, and getting a WIDE SHORT leg, (LOL)
You should instead, use a 30* measurement.
SEE?
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Just Common Sense......
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err....I'm not a Doctor, but I'll take a LOOK ! !