Kind of a late discovery, but if anyone has the SXK and the "6*0.6mm" air disk is just a bit too tight (I agree that it's ~1mm draw) and the "6*0.8mm" disk is too loose, you can take the latter and tape up a number of the holes to achieve a more preferable draw. I'd say three holes exposed is ~1.2mm, four exposed should be ~1.4mm. Five might be 1.5mm to 1.6mm, and for two you'd be better off just using the so-called "6*.06mm" disk.
Disregarding any claims of airflow wizardry in the design of the atomizer, it kind of sounds from starman112 like the "0.6mm" holes of the SXK clone are .45mm-0.5mm, and from my experience the "0.8mm" works out to ~0.7mm.
You could do it on the top of the disk too, but the tape could come between the disk and the screw that's supposed to touch it.
Edited on 12/13/2020 at 5:24 PM. Reason: