Thanks for this addition, Cleric!
I'm not sure if you made it to Part V yet, but this is very similar to what I had in mind for the ship's wheel exercise in that essay, i.e. adding imaginative resistance to the lighting up of the rotations. Now that you mention it, maintaining the resistance such that the wheel doesn't budge, thus bringing our activity to the brink of imaginative rotation, makes the most sense (perhaps after one full rotation of gradually increasing imaginative tension). It is certainly my experience that the inner activity begins to feel more 'weighty' and concrete after this is prolonged in a concentrated state, as if we are reaching into a deeper scale.
I also see how this heaviness can be extended deeper by resisting the condensation of the 'wheel' mental pixels themselves, and how resisting the inner voice in particular introduces finer differentiation for our concretized inner gestures. I look forward to experimenting with this! As you say, it is somewhat advanced and will require great patience and persistence.