Based on boiling 29.42 gallonsliters at 1.042 for 75 minutes, this will decrease your wort by 8.75 gallonsliters, bringing your after boil OG to 1.054. You wanted an OG of 1.060. It looks like it will be under.
Disappointing brew, fermented it cooler than I normally do for a saison, and held it lower.