As long as IK/KH/Q/W/T16/20L (Original 1.1mm) once is gapped to 0.8mm => more power and performance can be expected (immediate effect after installed).
Measurement of plug gapping to 0.8mm will be shown to buyer during order collection.
I don't know what to call this sound, but the term, I think, describes it best. Please click on the link, the description of the occurrence of the sound is perfect...