As boring as may be to some...this really does work.
If you are struggling with your present form or trying to develop one...the blank bale or other similar practicing techiniques are priceless for this.
What you do is eliminate the need or desire to aim while you are developing your form. It makes it much easier to concentrate on your form rather than distracting the brain by trying to also aim.
It would help if you had a coach or a mentor who could help you with this...but if you don't...just ask us any question that may pop into your head.
Watch videos on youtube and look at what good alignment looks like so you can have a picture in your head to strive for.
What you want to ultimately do is develop consistantcy with your form that is repeatable and feels rock solid. Once you have done that you can than begin working on aiming at close distance.
Since your vertical seems pretty good, I would place a horizontal line across your target with duck tape or something similar and aim at that at a specific distance until you are consistantly hitting it.
If you still feel you need to work on your vertical...do something similar by placing the tape vertical instead of horizontal on your target.
There are several different aiming techiniques that can make learning to aim a little easier but picking an aiming techinique that ultimately suits your goals, personality and ability is what you should do.
Ray