Mashed for 15 min. @ 148 added 152.4 degree water new temp 148.6 mashed for another 45 min
Based on boiling 7.50 gallonsliters at 1.045 for 60 minutes, this will decrease your wort by 1.75 gallonsliters, bringing your after boil OG to 1.055. You wanted an OG of 1.054. It looks like it will be over.