I sure wouldn't use Moisture Control potting mix for that plant. It really holds onto too much water, so unless you're growing water lovers like Cannas or gingers it would be really easy to overwater. Also if it's outside, and you get rain you can't control how much water it gets. Oh, you're in California, so have you still had rain?
Also, one of the yellow leaf shots above has dark veins. What have you been fertilizing with?