Honestly I haven't played with my blueberry since. I got a lot of base now so as soon as I get a chance I'm going to remix all the flavors I was having trouble with. Blueberry, cherry, melon, 555, ry4. I know there are a couple more(fruits). For me The most spot on fruits were, coconut, orange, pineapple, blackberry. Possibly more, need to organize tonight.
To the point, I have not had success with blueberry yet, but I really don't see it being anything but candy/artificial. If I try hard enough I'm sure I could get artificial out of any of my 'spot on' FEs, that's why I try to avoid it. I will try again with the blueberry tonight though, and maybe have a better answer for you.
Ok, just ate a handful of blueberries from the fridge. I really don't get much flavor from them. That could have something to do with it.