Standard salts, CaSO4 2.5g, CaCl 3.0g plus a quarter tab campden. Chocolate didn't quite melt all the way, microwave first next time.
Based on boiling 7.00 gallonsliters at 1.052 for 30 minutes, this will decrease your wort by 0.50 gallonsliters, bringing your after boil OG to 1.056. You wanted an OG of 1.054. It looks like it will be over.