Coming back to WHM

[Ulelu]

Is Aero 2 even as a DOT at only 60 potency even valid or honestly remove from my bar?

Yes, please always use your DoT's on every class in general, it may look small but it builds up, especially when in WHM's case the application does damage. You'd generally want to weave your Assizes in between these applications and your lilies where possible.