Although I'm not entirely qualified to speak here (electrical engineering student) and without knowing the exact particulars of your situation, I though I might give you one bit of advice. If possible, try running some of your major high current devices at 240 V. Remember that Watts = Volts * Amps, meaning if you double the voltage of whatever you are running you half the amount of amps neccessary to run it. Many computers can run at 240V with the simple flick of a switch on the power supply. Mainly though you should see how hard it would be to run things like your oven, dryer, hot water heater, etc at 240V AC.
If this isn't possible due to the wiring of your house, then just ignore my post.

Other than that you really need someone to come out and look at the wiring in the house to see if it can handle more current without posing a fire risk.
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bloom25
THUNDERBIRDS