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TPS61099: optimize feedback resistor values for lowest power

Part Number: TPS61099

Hi,

Is there a recommended minimum bias current for the feedback network? I'm trying to minimize the bias current for R1 & R2

without compromising the device function.  In the EVM, the bias current is Vout/(R1+R2)=5V/(1Mohm+0.25Mohm)=4uA.

My circuit Vout=2V so I was thinking of using R1=R2=1Mohm, which means the bias current is 1uA.  Is this too low? Can I go lower?

-Kelvin