call the power company and ask if they can make an adjustment at the transformer to bring the voltage up.
The power company could bump up the voltage but as Bjarney pointed out it will effect the 120 volt equipment.
Raise the 208 volt system up to 230 volt and you will have 132 volts at your 120 volt equipment. Even if you can live with that your neighbors might not want to.
Bob
Bob Badger Construction & Maintenance Electrician Massachusetts