The correct eye position is important for visibility and field of view, both on the ground and for LVP approaches. If the eye position is incorrect, the field of view in front of the nose will also be incorrect.
Airbus have a device on the centre window pillar to set both pilots' eyes in the correct 'design eye position' - in terms of height and forward/aft. You simply adjust your seat so that a red and white ball exactly line up when you look at them. Do Boeings not have this?
If you have inadvertantly learned to land with your eyes in the 'wrong' place, my suggestion would be to move your seat little by little, keeping a note of the settings in your log book perhaps, and get used to each small change before moving it again - until you have the seat set in the right place.