Salts CaSO4 3.2g, CaCl 2.0g plus a quarter tab campden. WP start around 78C for 30 min.
Based on boiling 7.00 gallonsliters at 1.056 for 30 minutes, this will decrease your wort by 0.50 gallonsliters, bringing your after boil OG to 1.060. You wanted an OG of 1.062. It looks like it will be under.