Very interesting finding foehnsturm!
I'm also trying to tune in my PVA settings, can I ask a few questions?
That dark grey filament is your PVA? Interesting, mine is translucent (formfutura).
Also, how did you manage to not have the PVA ooze? Mine is oozing like crazy, no matter how much retraction i use. In fact so much that i end up with the shadow version of my print, next to it, only made of PVA . And lastly, how soft is your pva filament on the roll? Mine is super soft, almost like a rubber, even though it was always kept dry. Even on my printer its fed from a sealed box full of silic