It is a great idea to craft wines to the taste of your loved one. But you do not need to craft it all one way. You might find that you like it dryer so you can, as you suggest, divide it up and sweeten in different ways. But I would not divide it up into so many batches. Just 2, one your way and one her way. Test one batch against your own taste and let her test the other.
You seem to have a good feel for what you are doing as it is a good idea to further bulk age after you adjust the sugar. I find that if I sweeten a wine to taste and then age it a while it will taste less sweet. So I suggest that you sweeten it to taste, put it back for 2 months as you suggest, and then taste test it again and adjust if necessary before bottling.
Yes the tart taste is acid and is a good indicator that the wine will support sweetening. Sweeter wine requires more acid. It is a balance thing.
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Do use sorbate and sulphite to stabilize the wine before sweetening.
By the way I make dewberry wine, a close relative to blackberry, and it is one of my favorites. It always ferments very dry. Down around 0.990 or sometimes lower.
Ray
