I think your way of using the terms makes sense to me (except maybe “tactical”). I wrote a big blog post a while back where I suggested that by initially fixing on the term “positioning” rather than “position” the jargon invited a tendency to over-interpret or overcomplicate what positioning was about. But it’s really just about what position things have relative to other things. “Fictional positioning” is just about where things are in the fiction, both straightforward stuff like “I am behind the ogre” or “I am on top of the table” as well as slightly more metaphorical stuff like “I am the power behind the throne” and “My position at court is secure”. In an RPG you’ve got all sorts of positioning potentially going on, e.g. position on various scales of credibility about certain topics (“Steve the Civil War buff knows a lot about 19th century warfare, let’s defer to him on how this battle would realistically play out”) or position in the social situation of the group (“Ray is going to be grumpy all night if the NPCs don’t think his grimdark superhero is as cool as he does, and none of us want to deal with that”), and so on. The way that various elements of position translate into “what happens next” is pretty much equivalent to what Forge Theory called System.