We all know when the M600df first came out, there was a continuity problem, with sf tapes. Twas the reason everyone went and bought a hot or mod button.
Well, now I know what is the choke point, beyond a shadow of a doubt.
I previously speculated it was being bottle necked by the wire, which turned out to be completely wrong. The wire is the same gauge as the hot buttons, which is thicker and more robust then the wire on the HLX.
The problem turned out to be the sf plug itself.
Once removed, the DF reaches full output, with zero flickering, or dimming.
The hot, and mod buttons plug is visually more robust then the sf, on the inside, and out.

It took alot of trial and error to figure this issue out, not to mention...the sacrifice of a hot button, and sf tape. But now I know, and hopefully sf knows, and will solve the problem.