Apply smooth and continuous corrections so that the line-of-sight reference line remain...

Bottom line

In the correct performance of eights on pylons, the pilot should use a visual reference line that, from eye level, parallels the lateral axis of the airplane. Since the headings throughout the turns continuously vary from downwind to upwind, the groundspeed constantly changes, so the pilot should adjust by climbing or descending, as necessary, to hold the visual reference line on the pylons.