You're way off in at least one regard, probably several. First, I'm not following your comment on filling to the 7.9 gallon mark. That is a lot of water. If your carboy is 6 gallons, you seem to have lost about 3 gallons overall: excess two in primary and one missing in carboy. Your wine looks light to me and that could be the reason.
Please let us know exactly what you're making. Also, did you measure and mark the primary?