That seemed to be my magic number with the French Pipe. And after a long steep it really rounds out a bit, the sweet notes become more aromatic than taste IMO. With 2.5% a long steep just led to diminished flavor, and over 3.2% (up to 5 was as far as I went) I ended up with too much sweetness, even after the steep.
I think its a great juice, but it still needs something for that 'dark tobacco' side of the equation. But I tend to feel this way about most juices, even my favorites. I want to try mixing it with Cigar (when I get it), black and mild, VFC, etc to see if I can get it right. Maybe even 555.