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I might have a solution for you though! On top of no pressure response in Krita, I have been experiencing major lag making the program basically unusable.
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But from what I can tell the adjustments don't seem to affect the results in the diagnosis pad either. Unfortunately you can't make adjustments from here so you have to exit and go back to the "Digital Pen" tab to the sensitivity adjustment. On mine the pressure does work here, pressing harder makes thicker lines and you can see a live feedback of your pressure as a % in the box in the bottom left corner. From here you can access a full screen test pad. If you hit the gear icon in the top right to enter the settings menu, under "Device" you can hit the "Diagnose" button.
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No matter what I put the settings to, the lines look the same with no change in thickness and the sensitivity value meter on the right side of the scratch pad does not react at all. It seems that the pressure sensitivity scratch pad IS broken in the Huion software. Hey Sam, I just ran into this problem myself.
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