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You use lowest angle .
The right angle is which blade will cut easier.
it could be vary.

I would say don't try to shave ATG . Not good for newbie and Most people do ATG Because they cannot get...

This shouldn't happen. Even after your first pass you shouldn't have so much hair left.(in fact none uncut)
You making 6 passes there is still uncut hair?
Why it happens?
Dull razor(you ruled out...

I get confused a little.
1 why you hone shave ready blade again?(or i got this wrong)
Now 6 passes way to much you are lucky or you are using right pressure while you shave(no pressure at all)....