Bigalt,
Another problem with your method is that, because the post adjustment has three screws, when you are "leveling" the tonearm as you do, you are also messing with how vertical the post is. It should be perpendicular with the TT platter when viewed from the front of the TT. These parameters need to be set up and locked in. It's not something that you should ever adjust, unless you feel that they might have went out of adjustment over time.
Another problem with your method is that, because the post adjustment has three screws, when you are "leveling" the tonearm as you do, you are also messing with how vertical the post is. It should be perpendicular with the TT platter when viewed from the front of the TT. These parameters need to be set up and locked in. It's not something that you should ever adjust, unless you feel that they might have went out of adjustment over time.