That is even more reason to not crowbar those fuses. The wire coming into your house way back when was sized to be a 60 amp circuit. That was common back in the day when no one had much use for electricity past one light bulb in each room and a radio sitting in the living room and a new invention called a fridge in the kitchen. Now we suck power in many more ways and home services are 200 amp.
The idea of a main is it protects everything and the power coming in is not to exceed what the main will allow. Just because you can add all those individual breakers up and get some high number that doesnt mean your house feed will handle that. Once the sum of whatever is running gets to 30 amps on one of the two legs feeding your house you need to blow that fuse or risk melting wires and burning your house down.
What you really need is a new service installed with a new panel that has a main breaker built in and sized to your requirements.
On edit:
To try and explain this another way its like you have a supply line for your water coming into your house that is ¼ inch and right after it enters the house you tee it off into twelve, ¾ inch pipes and expect each of those pipes to flow full streams of water. I think you can see they would just trickle.
The difference is with electricity it will keep trying to supply the demand and unlike water will not be self-regulating the power supply at the pole is massive and will cram power into a wire to supply the demand until something gives. In your case what is giving is the fuses if the fuses are not there the thing that will give is the wire. Wires have resistance and resistance produces heat and heat causes fire. The idea behind it all is to stay within the safe limits of the wire, and in your case thats 30 amps per wire coming into your house. Your oven alone is on a 30 amp breaker. So you have to update or you have to learn to manage your power requirements. Updating is the correct thing to do and have it done to code and inspected. The absolute wrong thing to do is to jumper the only thing thats protecting you now.