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WEBENCH® Tools/LM2731: LM2731

Part Number: LM2731

Tool/software: WEBENCH® Design Tools

Same design was run on webench on 2 different dates this year (May and August). August report now produces much worse results. Pd of controller jumps from 18mW to 50mW for exact same design! efficiency drops from 90% to 82%.. We built this circuit and its efficiency is ~80%. not what we were designing for.  Are the specs for the FET in the controller worse than what's been modeled in webench? If thats the case then are you sure the mosfet parameter errors are this severe? we're talking about a 270% increase in power dissipation for the ic and 300% in other webench designs we have done
What is the source of this difference?
Is it a webench error or an error in the part’s datasheet?

comparison table in the same design:

since this device does not meet our expected efficiency 89% can you please provide an alternate design with a different ic that will.

WBDesign_6.5V_50mA_85C (1).pdfWBDesign 6.5V 50mA 82.4% (1).pdf