Whatever works for you is the right thing. I wouldn't comment one way or another on the need for aiming systems.
What I am curious about is the term "fairly high level" or I'm a "good" player.
Those are relative terms and really difficult to associate with whether or not an aiming system may improve your game.
My personal perception of a fairly high level, or good player is someone who can set up a full rack of balls, pull one off the top, set up a break shot, and within 4 or 5 tries, run 30 to 40 balls without missing. Someone else may feel it should be 50 or 60 balls, and someone else might think its 14 balls.
Others might equate it to beating some ghost guy ... I dunno about all that.So ... where you fall is your personal comfort zone if you're happy with where you are, you don't need anything.
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I do something similar but I just smash the 8 ball rack take BIH anywhere on the table and just try to sink as many as I can without missing.
Or sometimes I'll just randomly spread all the balls and try to make them I love this drill it makes me feel good when I can make 40 something balls before I miss.