Hey man, nice looking buds! I always was under the impression that blueberry was a strain that didn't produce well. Those BB at day 34 though don't look tiny at all IMO. Nice work.

As far as the flavoring/coloring goes, I believe you are supposed to wait until the last watering to add. I think the way it was described was you are supposed to let the plant dry out a bit more than usual, then add a good deal of concentrate to the water, and then harvest within an hour or two. I think the reason behind the quick harvest was because the plants break down the flavoring quickly. I tried looking for a link, but couldn't find it. Hope this helps