Maybe the jarring effect of the total stop is pronounced, because at least to me, scraping the car's front corner to a wall in a shallow angle is by far the most common way to hit a wall (for example when understeering in a corner) and it also happens to be something you mentioned you're still working on.
At least to me, the expected result of scraping the front corner in a shallow angle would be that the car would bounce back with reduced speed, allowing me to keep accelerating and start thinking about the next corner. I would shrug it off and think, "oh well, that's going to make my time a bit worse, but I can't wallow in it, since the next corner is already coming up". I would still be engaged with the action. Now if the car even slightly brushes a wall, the flow stops, and my attention shifts from the fun stuff to my mistake, and I have to slowly get the car going again.
But these were just my thoughts on the importance of the "flow". The important thing is that you get it to a point where YOU'RE happy with it. Hope this was of some help anyway :P