I have what I'd call a mid-fi setup, with which I'm trying to evaluate CanOpener studio. My setup is:

Mac - BigSur
SoundSource 5
FabFilter Pro-Q3 (for EQ)
SMSL M400 DAC - via USB from Mac
Topping A90 headphone amp
HifiMan Arya headphones (open back)

I got CanOpener Studio 3 installed, but I can't detect any audible difference when adjusting the crossfeed parameters (A/B testing, or just flipping the whole plugin off/on). Other settings (such as polarity) do have a distinctive change in the audio output so I know the plugin is in my audio chain.

My current crossfeed settings are: 150%, 60 degree angle with HQ on.

Any ideas why I can't hear any crossfeed changes?