I’m remodeling an older house which originally had a 60 amp main with screw in fuses. I’ve upgraded the electric panel to 100 amp service and had a certified electrician replace the main supply line from the meter to the panel and install a new ground. I’ve installed a new plug and new wire to a breaker and have been using it for a circular saw. When I kick it on, the lights in the house dim initially. I would have thought replacing the panel would have eliminated that issue, so looking for suggestions for why this is happening. The lights in the house are using the original wiring from the 40’s. Thanks.