When visualizing during meditation, I often slip from first to third and back again, quite naturally. In third person I usually watch from just above and behind my own head, but I do find that for me I possibly lose focus easier here . Sometimes I find I notice and experience a lot more in first person. It intensifies the experience.
On the subject of chakras I too naturally fell into first person, but I agree with SpiritTalker in that if it works for you, it doesn't matter which viewpoint it is.