Would love to find some time to make the phase cancellation test - btw I didn’t know this technique and it looks it could be interesting in other purposes too !
I just made the test on Ableton with the same samples in a Simpler and guess what I think I noticed it (even if it was less audible than on the Digitakt)… So I tried it again on the Digitakt and now it looks like I hear it less there too. That makes me (even more) crazy 
Imo that’s one more proof it was something not “tangible” …
And that’s a bit reassuring tbh 