I like all of your advice except this.You hit below center with a slightly downward angle. Don't believe these low and level instructors, especially if you hate miscueing.
Hitting downward doesn't add much to the draw action but does cause missed shots from swerve (masse from offcenter hits). And on the other hand, keeping your cue as level as possible doesn't increase miscues.
Unfortunately, it's impossible to hit the cue ball with a perfectly level cue because it has to clear the rail, but there's no reason to add to the problem.
pj
chgo