Added Campden tablet to strike water as it was heating My mashout temp was low (164) since my sparge water temp was only 195
Based on boiling 7.50 gallonsliters at 1.056 for 68 minutes, this will decrease your wort by 1.13 gallonsliters, bringing your after boil OG to 1.064. You wanted an OG of 1.067. It looks like it will be under.