Hello,
I made a small test here (with my newly bought K2)
Test here for text (and scroll up for pictures)
Short: With Setting Multiplier to zero “0”, the least waste has been produced. I contacted also Crealtity support about this topic, that the printer ignores basically the flush settings of the slicer. Looking through the G-Code, I found only Toolchanges - so the flush must somehow performed by the printer, although the files sent to the printer have all the settings in it at the end.
Stuck here as well.