If you give it a cleaning, use a stiff brush with the isop. alcohol - I'm using a brush that came with a razor, maybe a toothbrush would do as well, or something similar - 90% isop. is good to use, nothing lower, available at most drug stores.
Ok, I’ll try it. Thank you for the tip! 
You could also use a small cotton wool lightly dabbed in hydrochloric acid(or muriatic acid alternatively).
That will surely get rid of any oxidation or debris.
I’ve found flickering issues are very commonly associated with ground problems. The retaining ring on the switch pcb, or even the bare metal under the switch pcb, quite commonly causes these kinds of issues. Most likely there is a place in the multiple contacts that has dirt on it, visible or otherwise.
Richard has been using a thinner PCB for his drivers, make sure the driver is actually getting a solid contact on the retaining ring. If not, build it up some with solder blobs in a few places around the ground ring then double check the retaining ring. 
That’s been pretty much my experiences too.
This problem seems to magnify drastically when you start pulling 10 amps or more, which Dale does quite frequently.
When asking for lots of power, connections, wire size and length, spring resistance and battery sag mean everything.
BlueSwordM has a group buy going on here that, in addition to his springs, includes SST-20:
He’s ordered some, and I lost track of what he is still planning to order, but you can always ask.
The other option is Kaidomain currently offers the SST-20 in multiple color temperatures and decent output bins.
I’m expecting Richard himself to be coming in here soon with some really good news. 
Ohhhhh Riiiiichard……?
Wherefore Art Thou, Counselor?
LOL
I still have 3000k SST-20s left as iamlucky noted.
Any hints? LED's, batteries, drivers, lights? 
Yeah, give us some hints 
The suspense is killing me… :disappointed:
Please be programmable, linear drivers in various diameters (like Led4Power’s drivers but it more diameters).
I know the website says 20mm & 22mm boost drivers will be available soon. But that’s been on there for a while now.
New Emisar 18 LED light?
Lol I think you’re onto something
As Dale said the most common cause is a bad connection, usually either the driver retaining ring, the switch retaining ring, or the body threads which when either too loose or too tight cause problems such as forcing the mcpcb pads into contact with the reflector. Several places to look but start with the rings.
Ok, so was it something with 18 LED's? 
Ol news now...