Agree on the Titans. The list has enough macro to compensate (too much in fact IMHO) and every list needs a weakness and that would work well.
Also naming wise- Adepta Sonoritas is too broad I feel for a themed list. Maybe the simple additions to the name help with the vibe? Adepta Sonoritas Purgation Force has a nice ring
The Inquisitor should be the SC for the list not the Canoness. She'd defer to the Inquisition naturally.
Pick one aircraft and go with it. I'd do lightnings as they need more love
Pick only one AV for AA role. I'd suggest the Hydra. There's no justification in the fluff that they use Hunters while there IS for Hydras.
The Inquisitorial henchmen have silly amazeballs armour saves. No way on earth they should be as good as Marines.
These are way OTT for Inquisitorial Henchmen Acolyte, Inquisitorial Henchmen Sage, and Inquisitorial Henchmen Chirurgeon units (also they should be CH not units)
-Formation receives Fearless ability
-Formation receives Commander ability <- that doesn't even make sense
-Formation receives Invulnerable Save ability
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