Super Jet 12.7oz s glass...tray thickness

So I'm using 12.7oz S glass (With saline finish) for my tray. Foamed my sn with 4lb foam, shaved it to shape and glassing over. I was planning on 6 layers all around. Just flat water chasing boat wakes, I'm 225lbs. Is 6 layers good I should I do say 8?
 
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