Just bought the SXK. I also bought the insulators for 5 dollars. Do they have to be inserted into the SXK?
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Do you use temperature control? If not, then definitely not.
If yes, then out of the box my SXK had reasonably stable and low resistance. But for the lowest possible Static Resistance, and therefore most accurate TC, I recommend replacing the positive pin with an M3x16mm brass screw. If that's done, I do believe the insulator would be helpful under the head of the screw.
However my insulators still have not shipped from 3FVape so I don't know for sure yet, and won't for at least another week, maybe more.
I ordered them on Tuesday, along with several other items, and I don't know what's holding up the order. Unfortunately 3F give no information about ETAs for products. I raised a ticket with them on Thursday to ask, but they haven't yet responded. I hope they will tonight, Monday morning their time.
I posted details of the M3 brass screw installation a couple of pages back, so have a read of that to see the principle.
But see how it goes when you get the tank - check the resistance of a TC build and compare that to the expected resistance of that coil, using Steam Engine Wire Wizard. If it seems much higher, and especially if it's fluctuating or you're getting a bad TC vape, you could first try the new insulator and second try replacing the positive screw as I did.