Staad Foundation is Uneconomical in sizing calculation

I have designed isolated foundation in staad , 

The sizing of foundation is coming very high , eventhough my foundation pressure is very less ie) 40 kN/m2 , allowable is 200 kN/m2.

In-terms of sliding and overturning , i am getting minimum of 3.02 ratio.

Can u please suggestion on it , why i am getting more size.

 I am attaching my staad file along with this Master.xmlMaster.sfa

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