Looks like I lose about 2 Gallons per hour to boil loss using the Blichmann 20 Gallon Brew Kettle.
Based on boiling 8.90 gallonsliters at 1.060 for 60 minutes, this will decrease your wort by 2.50 gallonsliters, bringing your after boil OG to 1.077. You wanted an OG of 1.054. It looks like it will be over.