Mashed a little higher to give it more body. 1.5 L Starter with 1/8 tsp. yeast nutrient on a stir plate for 18 hours.
Based on boiling 6.87 gallonsliters at 1.048 for 70 minutes, this will decrease your wort by 1.17 gallonsliters, bringing your after boil OG to 1.056. You wanted an OG of 1.062. It looks like it will be under.