Here is some advice by Martin J. Dupraw, a world champion shorthand writer. This little nugget is found in the Gregg-Kit 2 Series 90, pg. 105. The shorthand was written by Jerome P. Edelman.
(Feel free to swap the .jpeg out with the .pdf I sent you, Carlos!)
Each writer must set his or her own size for shorthand writing. Whatever size seems right to you is probably the best size for you. One skillful shorthand reporter writes 500 words of shorthand on an ordinary notebook page; another writes only 50 words on a similar page. Neither extreme is recommended. But if you naturally find yourself writing very large notes or very small notes, you need not be concerned about it. The size of your notes will have little or no effect on your speed.