Spark's first grow - Blueberry

This one was such an eager beaver, but I'm worried that it's gotten ahead of itself. I've been taking it outside for a few days to try to get some indirect sunlight when the weather was nice, before I can properly plant them in the ground. The stretching seems to have slowed, but I still need to hold it up to keep the leaves from swinging all over the place (and away from the light). There are some brown spots on the leaves that look dry... I'm hoping I just had them too close to the light or something and that it's not disease.