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Worry less about perfect flat...
The important bit is that each hone has
the same shape. When the razor moves from
one hone to another it needs to see the same
surface profile that it just saw....

+1 on advice from hi_bud_gl

Just spray it lap it quickly and lightly then hone away.
When you lap it try to remove less than half the
thickness of a sheet of paper or less each time.

Take...