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I FIXED THE FLICKER!

I just received this light a few days ago and noticed the flickering only on HIGH output. It also wouldn't let me change the output levels while it was flickering.

Based on junglejim13660's comments, I looked at the electrical contacts. Initially, I thought the contacts were the body threads themselves like a Surefire—but then I noticed the gold-ish ring inside the head unit (top of picture), and the very thin inner ring on the tail body (bottom of picture). It made sense to me that it was trying to push higher amperage across what is essentially a one-man rope bridge causing the flickering.

I grabbed a very flat knife sharpening stone and very carefully 'lapped' the tail body contact ring (bottom of picture)—almost as you would lap an AR-10/15 upper receiver—so that it would have a more even and flush fit with the head unit contacts. I cleaned the contacts and reassembled the light. No more flicker!

To check my theory, I loosened the body a tiny bit; just enough so that the connections made contact. Behold, the light flickered again. I tightened it back up with normal torque and the flicker is gone once again. The one-man bridge has been upgraded to wood. I assume the lack of bare aluminum contact surface is a compromise for a thinner overall body. Though, this fix is something that can be easily done in the QA process.