Salts CaSO4 3.2g, CaCl 2.0g plus a quarter tab campden. Expired pack-1L starter-4L starter for yeast. Chill to 10C, O2 and pitch, then ferment at 11C.
Based on boiling 7.00 gallonsliters at 1.051 for 30 minutes, this will decrease your wort by 0.50 gallonsliters, bringing your after boil OG to 1.055. You wanted an OG of 1.056. It looks like it will be under.