Yes, in all my lucids there is a sense of 1st experience. The rembering comes mostly from non-lucids or really, really short lucids that I was forcefully woken up from, which is why to me, that distinction makes no difference.

And again, these happen in lucids during the early sleep cycles, the middle and later ones. I find your way of dreaming very interesting, since you note a difference based on waking time that seems to be global on dream-content and lucidity.

Is it? I would associate it more with doing it in such a broad area at the start. I think it is much easier to get detachment by using Scan when you still have a body on something small. Maybe touch a chair and try to feel its present/past/future with your being and so on, then you can move over to something bigger like the enviroment.