I use fruit juice a lot, but mostly because I'm too lazy to cut up fruit, it's so much easier to buy a few bottles of juice to keep in the pantry and then they're there when I get around to bottling for my 2F.
When you did the blueberries, did you cut them up at all? When I do use berries, I cut them at least in half, and larger things like strawberries I cut into fourths. More surface area exposed in the booch=more flavor, from what I've read.
If you figure out the Gingerade thing, please post how you did it. I've given up on recreating any of the GT's flavors, they never turn ou