I never answered this because I wasn’t paying attention to the Dabble forums at the time you posted it, and I didn’t want to commit thread necromancy.

I have a similar process to you – pantsing and then planning. I started writing novels because I wanted to share stories from the tabletop roleplaying games I’ve participated in. My wife and I play a homebrew game that emphasizes character interactions and de-emphasizes combat (which is heresy in some corners of the tabletop roleplaying community, but I digress), so it’s more possible than it would normally be as compared to regular D&D.
So I usually come up with a character, noodle around putting her into interesting situations, and sort of do my pantsing that way. Then I take the raw material I’ve come up with, figure out my through line, and take The Monster Novel Structure Workbook by R. B. Fleetwood and impose some structure on it.
Much like you, @Keith_Leonin, I have a template I’ve put together that has the different story beats listed – that method has three acts and twenty-one beats.
I rename the character and notes sections to make one a production journal and one my text graveyard. I like to record how I’m feeling every day as I draft, and I never delete any kind of text, so these are all I need.
I also have a project bible in Excel where I keep my calendar, word count log, finish date calculator, and any extra things I want to keep like pictures for inspiration etc.
(This is what the calendar tab looks like btw)
I’m also writing articles from an in-world newspaper and publishing them via Substack every 6th, 12th, 18th, and 24th of each month. My wife also writes for this, as well. For that one, I just pick a concept and run with it; it’s not hard to write. I do use the same calendar in Excel, but that’s about it, at least for now. The last “article” I wrote was on a hated food critic visiting a restaurant for ghouls after the readers voted for her to go there. She was not amused.