Target water profile: Ca=110, Mg=18, Na=16, Cl=50, SO4=275 Additions: Gypsum Calc. Chloride Epsom Salt CaSO4 CaCl2 MgSO4 8.9 2.6 5 13.8 4.0 7.7
Based on boiling 13.60 gallonsliters at 1.055 for 60 minutes, this will decrease your wort by 1.00 gallonsliters, bringing your after boil OG to 1.059. You were planning on an OG of 1.059 so you are right on track. Nice job!