I just got my new Model S, top of the line with Ludicrous mode. The only problem is that it only charges at 48A and my prior model S charged at 80A. Is there a way to upgrade this? It's a major bummer to be charging at nearly half the rate. Why would Tesla downgrade the charging on their new models? You'd think they'd at least have the 72A on a $130k car. Are there any options here?