I picked up 4 lugs of Lodi Cabernet Sauvignon grapes today and hauled them two hours back to my house. My pH is 3.5, TA is about 4, SG is 1.112 and Brix is 25.8 adjusted for temperature. My Free SO2 test (Accuvin) is 0. Confused about what to add to the must...help. Thanks, james