I bottom feed my mash tun so my temp on strike has to be higher cause I don't pre heat my mash tun my strike water is @ 180F and srops to 158F
Based on boiling 6.96 gallonsliters at 1.049 for 105 minutes, this will decrease your wort by 1.75 gallonsliters, bringing your after boil OG to 1.061. You wanted an OG of 1.066. It looks like it will be under.