I started with mine perfectly level, with no rocking of hips, and rode. Feeling myself slide forward on the seat told me the back was too high. Sliding backwards found the front too high. Once I got the level right, slight adjustments to height made it perfect.

Keep in mind, that adjustment fore and aft might also be required, and that any change affects the other adjustments, so you might have to start over several times.

You might also need as much as 1000 miles to break it into yourself, tot he point where it disappears, but comfort will improve drastically, once you have the position correct. Might also occur with as little as 100.

Once you are going the wrong way, it is immediately apparent.

When you get it right - it will be obvious.