Splotchy throughout...

[Mike Té]

Hi. I've tried searching for examples and answers, but no luck so far...
What could have caused the splotchiness that I'm seeing throughout my rolls of Delta 400 here?
One session of 5 rolls; all are like this. Microphen at 20 degrees, 4 inversions, swirl and thump at first, then 2 inversions every minute. For time, following MassDev chart.
TIA

 

[Mike Té]

Next day, old Tri-X 320 in old DK-50; clear as a bell:

 

[Pieter12]

https://www.ilfordphoto.com/statement-120-roll-film/

 

[Mike Té]

I'm a victim of the Ilford Mottle....
I never thought that it would happen to me.