changed hops to 2.5 oz. first wort only, and increased boil time to 75 min.
Based on boiling 8.00 gallonsliters at 1.042 for 75 minutes, this will decrease your wort by 1.75 gallonsliters, bringing your after boil OG to 1.051. You wanted an OG of 1.054. It looks like it will be under.