glass bowing after ceramic frit application

hello  we are experiencing a tempering issue maybe someone could help us. We are tempering 3mm soda lime glass  dimensions are 22 inch x 30 inch rectangle. when we temper a clear piece of glass this size it will come out flat . But when we screen print a ceramic frit  3 inch border around the glass and temper the glass  the glass has a bow and is not flat. We have adjusted heat and or quench to solve this problem with no solution so far. I think my question is basically  is it a heat issue or a quench issue.Any thoughts on this problem would help greatly.  Thank you


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