two suggestions,

     1:   cut the stencil hole with a thermal image (4 quadrants). this
allows the paste to collect on the plated               perimeter without
allowing paste through the centre.

     2:   Allow the hole to fill 100% but fit an underside support pin the
same diameter of the plated hole.
          When the board releases from the pin a paste vortex will be
formed taken the shape of a cone.

Felix

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