What kind of scale are you using? How low is the resolution?
What measures are you taking to ensure that no oil (or lye water) is left in the measuring container? With tiny amounts like that you have a much greater chance of lye heavy soap.
FWIW, I usually add about 5 to 10 grams extra oil in all my batches, just to make sure I'm not leaving any out, better a smidge more oil than too much lye.