Salts CaSO4 3.2g, CaCl 2.0g, pinch of MgSO4 plus half a tab of campden. Ferment at 17C, free rise to RT on day 5, Fri Nov 4.
Based on boiling 7.20 gallonsliters at 1.048 for 30 minutes, this will decrease your wort by 0.50 gallonsliters, bringing your after boil OG to 1.051. You wanted an OG of 1.061. It looks like it will be under.