Saying that you lack the capacity to determine a thing and saying it's uncaused are two different things. I didn't fail to address this prior. I suppose it could be individual atoms "choosing" to decay one by one until the urge (influence) no longer exists. Maybe some of them have more willpower than others. Sounds silly and anthropomorphized, but hey, you haven't proven otherwise.
That's just another example of systemic randomness--equates to humans not knowing the cause, rather than presuming the lack of one. Ontological randomness would propose that there is literally no cause, and that's not deterministic.
So I did address that in the prior post.
Sounds functionally like a building pressure being released intermittently, and despite not being a physicist, I'd have to guess that the math reflects that. The part that you haven't determined in the equation is the difference between urge and choice (force and selection). Metaphorically, you could tie that quite directly to ideas about cognitive-behavioral therapy. The "cognitive" part is the only branch of psychology that acknowledges free will. And it works. It's the only therapy we have that works well, other than feeding people drugs and performing surgeries.