Every job saw a potency reduction.
Drill was 700 potency and is now 550 potency but most jobs saw the same kind of """nerf""" due to the squish.
Heatblast had a 20 potency nerf compared to media tour.

MCH remains quite low DPS wise, especially for a DPS with no support at all.
So you can expect a slight buff in two weeks. Don't expect the Moon.