Keep in mind that v-scores will usually run from edge to edge of the panel.  So 
your stiffener tabs will actually have the same v-score as the array, meaning 
they add no stiffness.  While your idea about slots to reduce stress will reduce 
some stress from hand depanelization, you are still better off with a pizza 
cutter and v-grooves.  You will use less laminate, and have a stiffer panel.

Making some guesses - .06 slots, .2 borders.  Go to v-scores, 18 up instead of 
20, your board now is just under the 11" Y dimension that fits so nicely on a 
pallet.

If you have to worry about wave solder coming up throught the slots, you 
have to worry about your wave process.

Pete

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