Add 1 tsp Irish moss 20 min. Add 2oz vanilla extract flame out. Add 4 vanilla beans soaked in vodka in secondary.
Based on boiling 6.25 gallonsliters at 1.049 for 70 minutes, this will decrease your wort by 1.17 gallonsliters, bringing your after boil OG to 1.058. You wanted an OG of 1.059. It looks like it will be under.