You've gotten some good advice from Beiber & Measureman & a few others.
The thing is that if one uses english rarely... they will never really get very good in it's use because it is very much a feel thing.
I started using it within a few weeks of being introduced to the game at age 13.
Hitting the exact vertical center line of the cue ball with the exact center of a 13mm or less cue tip is not an easy task for a human being & especially when that small tip also has a radius on it.
I think many that THINK they are hitting "center" are not doing it as often as they think & the misses that they have may be do to that miss hit even when ever so slight. One needs to nderstanf the squirt & swerve factor but without being afraid of them, One needs to make them their 'friend'.
When one uses english, side spin, in all of it's combinations with top & bottom, one has a plan for it either as an aid to pocket the ball, to move the CB differently from 'normal', or both & to me, a slight miss hit is not as penal vs trying to hit that infinitely small center line consistently.
One can just look at the 90* tangent line to the shot for the 'natural path' to sort of see where the ball would go if it were sliding with NO spin at all. Then one can hit with top or bottom to augment that line.
Then one can combine top or bottom with some side to augment that line differently.
If you're Playing the Game & trying to run out... you should use it all when needed...
if you do not have a mind set of one way or the other that would prohibit or entice one way or the other.
You will be the one responsible for your game so it is up to you to make your own determinations.
Like CJ Wiley was so found of saying... The Game is the Teacher.