Just now I tried with Full OC, Green Scream, Mouse, Metal DS ... same issue with all of them.
I tried using the same DI track I used in the first demo (Strat with some heavy strumming that makes the Profiler's input LED flash green with some rare peaks into brief yellow).
Up until around 2.3 or 2.5 the boost seems pretty natural and "open" ... from that point further up this weird compression starts to kick in.
That's my point since days.
It is not something related to the KD, but probably you are facing a software bug.
When we chatted about your comparisons to your Klone and volume boost a week ago, we discussed that the boost really kicks when the AMP Gain is set above 2.0, which is a crucial thing, but not related to this bug.
During your comparisons, such a "volume drop" bug must have occured as well, but you didn't mention it a week ago.
Did it happen back then as well?