Older neighborhood? Do neighbors have the same voltage issues?
what size is your current service & feeders? With what you list, I'd expect at least 100A. Is it just your voltage to neutral that fluctuates? how much drop is there phase to phase?
A 10 volt drop even with a dryer, AC unit and a couple stove burners seems a little much if everything is sized properly... My voltage at an all electric apt I had only fluctuated from about 121V to 118V even with the 240V window shaker/ dryer/washer stack, dishwasher and the stove running... On top of it all, it had a Zinsco panel
