Pre boil gravity 1.044 11 brix Post boil gravity 1.062 16 brix Final gravity 1.010 6.8% ABV
Based on boiling 7.00 gallonsliters at 1.044 for 75 minutes, this will decrease your wort by 1.25 gallonsliters, bringing your after boil OG to 1.052. You wanted an OG of 1.081. It looks like it will be under.