It sounds like you are experiencing a voltage drop when an appliance kicks in, then a surge when the appliance comes to normal operating voltage. You must remember that some appliances when first engaged will demand voltage in order to bring them up to their REGULAR MODE OF SERCICE (motors and the like). It certainly would help if these appliances were on a dedicated circuit, a couple of reasons come to mind but home safety is first. Second would be to avoid the problem you are having. Do you have surge protection in place?
CAV104
