Part of what I was about to say agrees with @Fractal_Explorer.
I feel like because of the way our model of the mind evolved here in the West, discussing these types of topics can be a bit problematic, because we believe in a distinction between the conscious and subconscious mind, and yet have no clear definition of the term consciousness. I myself am only beginning to fully appreciate how things really work through personal experimentation and listening to satsangs and talks by people who have covered this territory before. Nevertheless, I’m going to try to describe what I think is going on.
When we don’t fully live an experience, due to it being too painful or due to intoxicants causing a lack of conscious focus, or when we don’t let go of the experience when it’s done, the mind-body complex tends to hold on to patterns that continue to vibrate and surface in our chit, in the movement of our consciousness. Certain cult-like religions 
call these engrams, others have called them incompletions. Some of them are stored in the bio-memory or muscle-memory of different organs. Our mind is ordinarily almost continuously in motion due to our lifestyle and the orientation of consciousness produced by it.
Because we don’t often pay attention to our bodies or organs as we go through life, or to the contents of our minds except for what the light of awareness is currently shining on, nor do we focus on unifying our mind-energy and memories into one giant conscious being, most humans are generally fragmented and parts of us can fight against the other parts because we don’t acknowledge the conflicting viewpoints and try to resolve the conflict.
Getting back to the “momentum” as the example, part of you may wish to guide the sub in a different direction, while another part which has not been consciously acknowledged and completed with is against this decision. In our Western system we would probably see this as a mental or subconscious complex, and the reason you can’t identify with it and connect with it easily is due to the need for unification of the mind and body in the flow state to allow it to come to the surface while performing self observation.
To be a bit more specific about it, because you believe you have a mind and a separate body and a spirit and so on and so on, rather than accepting the union of all these at the level of consciousness, the parts do not regularly communicate except through existing channels.
I’ve made a lot of posts on here about flow state and getting subs to work better and what I had found worked for me at the time, and generalized it into getting a flow of information/energy between different parts of the body and mind. As I’ve started working more and more with the idea of Advaita as the principle that allows “supernatural” abilities to surface (I put that word in quotes because they are actually as natural as breathing and it is our own fragmented state of being if anything that is not natural), I’ve begun to really understand why the various techniques for flow state work, and why people often don’t get results (or results the way they want them).
To me, what you’re describing is a clear case of multiple agendas or mind patterns operating within you, and you perceive this as self-sabotage or momentum in the wrong direction. The way to fix the problem is through using self observation processes like vipassana and flow state to identify and “hear out” the other component of your mind/memory, and then either let it go if it no longer serves (transform), or adjust your course based on what you learn.
I have my own incompletions I need to deal with at the moment (one of them as to do with the seeming divide between my passions/spiritual path and wealth/success), so it’s worth me pointing out I’m not exactly the poster child for this discussion, I just have enough awareness of it to be able to string a few words together about it. I’m still perfecting the fine art of dancing with the disowned parts of self.
