"Enhance Pointer Precision" is just a fancy name for "use mouse acceleration."
If you use Raw Input in CS:GO, it is ignoring all Windows settings and the game has total control on sensitivity and mouse acceleration settings, so by your description it would look like you are not using Raw Input. This isn't a problem, just an observation.
Some players do enjoy using acceleration, most commonly they are high and medium sensitivity players. Essentially, acceleration is just taking the speed of mouse movement and multiplying it by a set value (or values, via a curve), causing your aim to go farther than what is happening on your mouse pad. If your mouse movement is slow (via small aim adjustments) then little to no acceleration is applied. If your movement is fast, then you can do large aim adjustments (turning 180 degrees) in a small length of mouse pad.
A player that uses acceleration is focused on controlling mouse speed, not the distance it moves.
A player that does not use acceleration is focused on controlling the distance the mouse moves, not the speed.
The focus of these two types of players are the exact opposite of each other.
A player that uses acceleration will be relying on visual feedback from the game to constantly make his mouse speed adjustments.
A player that does not use acceleration only needs to know that target X is Y degrees from the crosshair, thus he needs to move the mouse Z distance on the mouse pad. The speed at which he moves Z distance is essentially "as fast as possible" because if he's too slow then he might die before he can move the distance required.
With no acceleration (and a proper sensor), the player's mouse movements will always be a 1:1 match to the game's movements, allowing muscle memory for distance to completely take over.
Due to human error, the player may not always move the exact mouse pad distance he intended to, and would miss the shot if moved too little or too far. This is where low sensitivity comes in. At a low sensitivity, large mouse movements are required, and the larger the mouse movement needs to be, the bigger the margin of error in your movement distance can be. At high sensitivity, being off by a fraction of an inch can mean a total miss, but at low sensitivity, being off by a fraction of an inch can mean you will get a headshot, it just wasn't a perfectly centered one. Who cares, you still got your headshot.
At the end of the day, the best settings for you to use are the ones you are most comfortable with, but don't be a afraid to experiment. You may discover some settings that are better than what you have now, and you'll be glad you switched.