You have an awesome car. I've taken trips up through North Carolina and beyond without significant issues in my Model S. Sometimes there have been Supercharging slowdowns that almost always have been resolved by switching to a new Supercharger connector. Tesla is working to improve the Supercharger network and has plans for a next generation 350 kW+ Supercharger, which I think will be really great. It may even have a wireless option (similar to how Plugless Power works). I would give Tesla time to resolve the issues at some of the Supercharger centers such as Burbank.