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The thread below shows 16º(approx) is about average for most razor edges, ie spine to edge angle, so 30º shaving angle is lower than most think if you factor that in....

The secrets to a good shave.
Hot towels. Lather that looks like shiny whipped cream. An shaving angle that is almost flat on the face & a sharp razor. Ohh & I forgot... Lots of practice. :)