I have been making wine from juice for many years. I retired and added grapes to the wine. I am not yet familiar with how wine from grapes tastes as it goes thru the process. I have a 54 liter demi of a nebbiolo barbera blend, that i started in September. I racked it and it tastes somewhat tart. Is that normal for wine from grapes at 4 months. I usually use juice buckets.