Seems like 6 cups of sugar is pretty little for 6 gallons of wine. That juice couldn't have been that sweet. What SG did you start at? And where were you when you transfered it?
I've made lots of wine with frozen concentrates and even after diluted to make 1 gallon, I seemed to have used 10-12 cups of sugar for a 5 gallon batch to bring the sg to around 1.085.
I hope you can find your sollution Buff.
Good to see so many new members from Wisconsin. I am a Wisconsin son and it is good to see some fellow "cheeseheads" in here. I've been in Alaska for 30 some yrs so I am not from there anymore, but there are only 2 or 3 members from Alaska in here. Guess I'll settle for you Wisconsinites then!!! LOL
Good Luck
Troy