I'm currently a student and I write non-fiction every day. I've committed myself to writing 1000 words every day, and I am successfully doing this.
However, I'm trying to improve a particular aspect of my writing process: almost every day that I write, I write in "bursts" of about 1 to 10 minutes of highly productive writing, during which I'm almost writing non-stop. Then there are these "dips" of about 15 or more minutes, during which I am literally writing not a single word.
I know that it is unreasonable to expect to write in perfect uniformity exactly the same amount of words per minute. I absolutely don't have a "purity" goal like that.
Nevertheless, I feel that I could really be much more productive, qualitatively and quantitatively, if I could at least develop good habits to diminish these dips (as much as possibly anyway). Those dips also are sometimes a bit stressful, since I'm generally kind of "stuck in my head" at those times, rather than relaxed and in the flow. But that is only a secondary problem, since I'm mainly concerned with improving my productivity and quality of writing.
Generally what happens during these dips is that I don't know exactly what to write (though I always have a vague idea), and then kind of get "stuck in my head" about what to write. Often this results in me just "zoning out" without focusing on my writing.
What kind of practical techniques or practical advice has helped you to improve your writing process in this regard?
Edit: I am already using the pomodoro technique, where I write 50 minutes, and then meditate 10 minutes, then write 50 minutes again.