After having re-written the plot outline a couple weeks back, I am now taking some time to map out specific chapters and scenes within those chapters, adding detail where I think it's needed. I've also cleaned up a couple of additional issues that were minor, but would have come up sooner or later during the writing. So now I've prevented them from coming up at all.
I don't like admitting that I still haven't written any prose, but the flip side is that I like the new-ish plot synopsis and character arcs more than I did at the start of this journey. Still not done with the plot detailing yet, but about 75% complete.