Ok – I never use Highlight Priority or Center-weighted average, only Manual
(but wonder, why you want to batch process the exposure).
→ All 3 ‘modes’ work on the Exposure.
So, using Manual ‘resets’ those beforehand chosen value(s) to the new Manual setting.
→ Instead of your second step Manual Exposure try the Tone Curve tool, which is useful to adjust black-/white point, contrast and much more.
BTW,
there is no specific order how to use the tools (PL acts parametric).