Math was my strong suit in school. Well untill I fell behind as a cadet at USAFA. I always attack the game as a math problem. Grady Mathews expounded on percentage.
Sooo my methods evolve as I continue to learn.(the upside of CRS) My day one came after I built my first table in 1974. So I had the equipment and a pamphlet by Willie Mosconi. I understood the value of book learning based on my success with Jui Jitsu that I learned from a book.
My experience is that the toughest players came from a tight group that sparred together. (Small money games) I t was my method to involve with the competition as much as I could afford.

I tried to stay even balanced play. Sometimes weaker and then challenge the big boys. I played every night and practice every day.
I got lucky when I encountered Backward Jan. He had a weekly route. When he came in I would shoot $20 at him, with the "how long can I last" method. It didn't take long for me to figure out that it lasted as long as he chooses. (About an hour) So on the next meet, I just asked him for $20/hr lessons. I knew him as a one pocket master and thought I wanted him to teach me one pocket.
His reply hit me like a bolt of lightning.(notice my favorite theme) His reply was, "I will give you lessons on one condition."
"Ok, uh What Condition?" I inquired. " That we go back to basics." Was music to my ears. Oh and there was another stipulation and an understanding. There would be no gambling while under his tutoring. And unspoken but as a matter of respect to your master you never consult another master while his student.
I struck gold! 6 weeks of one hour lessons with one hour nightly practice (after work). It took me from a mid B to a contender in 1989.
That obviously had to be modified over time as my life situations change was uh well my lifestyle. I am a survivor.
I am of the opinion that a good balance between practice and competition is the optimal situation. I am familiar with the significance of both. Pretty sure Grady would give it a good 90% chance of being successful.