I am using the SunCal concentrate and it just is not rich enough. My husband and I love red wine and there are no fruits here to work with (we are on an island in Belize). The concentrates are the best for me since I have people bring them whenever they visit. However, I have not tried dried fruits, which would be even better.
I have added the following in the past to my red wine, which helped:
peppercorn juice (I boil and reduce)
dark raison juice
blackberry flavoring / glycerin
I have also ordered the tannin that you add after fermentation, but haven't received it yet (I have a batch that is almost finished that I will use that on).
I did order enough for a 1 gallon batch - maybe I will make it and blend later through tests (if it is that strong).
Thanks for your advice!