None taken, just speaking from training and experience. I was on the same train of thought until I was proven wrong. When you apply some of the laws of physics it make perfect sense.Your technical explanations were interesting to a number of us in this forum; just hard to reconcile with personal experience. No offense intended.
Any chance you've still got the old (bad) sensors? I'd be interested in hooking up an o-scope and seeing if the 'twitchy' signal could be quantified to help others in future diagnostics.To OP.
Was your TPS changed out?
If so and you are still having this issue I would change your APS, assuming you already had/have your ECU flashed which helps smooth everything out.
I had the issue you described for a long time. I tried spark plugs, coil packs, tb sync, diff fuels, new throttle tube, and kevs O2 controller all to no avail. Almost gave up. After seeing some posts on here changed my TPS and APS and problem finally solved!
I believe the cause is one or both (APS & TPS) give out an unstable, call it twitchy, signal which in turn causes your tb butterfly valves to "twitch". The joys of ride by wire 😉
This is not true for a fluid! It will still flow through the small port. And it will affect the throttle at any rpm.no longer flow through the port.