you should be able to adjust it more than .10v. Play with it a little of moving it clockwise, conter clockwise. You can also move it up, down, left and right that will help lower the voltage. Worse comes to worse open up the hole where one of the screws go in just a little.
As for your battery you can remove the positive cable and it will reset the ECM but my personal choice is to remove the negative cable instead.
Still try and do what Chris said by unplugging your EGR and capping the vacuum line.
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