I am using version 3.5.6.0. I mostly use the Variable Data Module. I would like better control over positioning of the fields, to aid the visual placement.

Pyxis Imposed versions 3.5.6.3 and above include such options. You can set the X and Y coordinate of each field, in addition to the width and height. Note that since version 4.0.0.0 (August 2016) you have new Field Control options, with many new settings.