I trust the craziness of your week went well, and that everything got picked up and put where it (more or less) belongs.
Good on you for asserting a practice commitment! As always, keep it
SMART, which it looks like you have. One query: is logging the practice part of your commitment?
I like the JNG followed by DN. As you sort out the subtleties of the perceptual shifts you describe, especially as JNG is challenging for you, the contrast between these two practices should be helpful because they span the range of "effort" to "no effort". I think of DN as "cut the power and coast". Just remember (I mean of course to keep in mind at some level, not to actively try) not to interfere with any Concentration, Clarity, and/or Equanimity that may emerge in the Do Nothing phase. And of course, if you happen to enjoy it that's great, but you are not allowed to try to get that to happen either; that's for the Nurture Positive wrap-up.

I have to admit, sometimes I am really good at it but at other times I have great trouble maintaining the discipline to stick with what I set out to do. I find that no matter how long I set the timer for, I regularly "come out" 5 minutes before time. If you are doing a set drill, with the three parts as you have described, with that kind of contrast between them, I am very curious if you will run into this and start anticipating the next practice and how that will play out for you? And then beyond that, I am also curious how you will play that edge given the "exceed-able" practice goal you have set.
Your report of wondering "how am I going to describe this" is exactly on point. Being witnessed accentuates self-presence, go figure. Use this to your advantage.