My 240 volt outlet seems to be delivering 219 volts
240V is a nominal value. Depending on how far away you are from the power station or other factors, it could be higher or lower, 219V is a perfectly reasonable value. It is also unrelated to the problems you're having with your oven. Most ovens have an internal thermostat that controls whether or not the heater operates. When you don't get enough voltage, your oven will still heat up to the given temperature, it would just take longer. (Unless the voltage is so low that it's not able to hold heat, but 219V is perfectly fine.) Also, I'll note that most oven thermostats aren't that precise; it can pay to have an oven thermometer around if you need precision. 

At this point, the electrical system appears fine up to the point where it hits the oven. If both the stove and oven are the same appliance, I'd consider the possibility that something's off inside them. For example, if the plug isn't connected properly to the actual oven, and the oven only has one 120V rail, you could indeed run into problems.