If you wanna make fewer open shots, lower the
shot timing slider more. It means you'll have less control over the meter regardless of how open you are and thus greens don't always mean greens. There is no perfect way to only make fewer open shots but more contested shots because those are obviously completely opposite things.
You can absolutely tweak more than the two sliders to try and approach that goal, but if you want to make more covered shots, what that really means is you want the game to act like the defense isn't actually there, which means you'd raise the
shot coverage slider NOT lower it -- thus the game will think you're open more often even when you're not (which I guess is slightly confusing, yes)
But like the article, I will tell you this will drive you insane trying to find what you're looking for. I would usually recommend settling for just trying to make fewer open 3s as a baseline and then maybe try tweaking from there but first solve the open 3s aspect.
This is how Mike Wang described them years ago just a heads up:
This slider [shot coverage impact] adjusts how much coverage impacts the outcome of a shot. At one end, I forget which off the top of my head, shot defense does nothing (open shots don't give a boost and covered shots don't give a penalty) and shots are decided just by shot timing and attributes. At the other end, shot coverage dramatically dictates whether you make or miss. Effectively, it makes open shots super easy to hit. This slider is useful if you're more of a sim head and want to reduce the gap between open and covered shots, which is actually closer to real life.
There's also a Shot Timing Impact slider. That one exaggerates the impact of shot timing. So on one end, bad timing will yield more misses and good timing will yield more makes than default. At the other end, it basically turns off timing bonuses/penalties altogether so it'll be like playing with Real Player % turned on.