Have you measured the Tenergy? I'm just curious, I know you have one and it fits for you, but we don't know how good the tolerence is on the Arctics from one unit to anther. The CPF test thread shows it to be 66.7mm in length and their source for them was batteryjunction. The Sanyo's & LG's are UL listed, but are un-protected.
I have been using the LG's for a long time with my RPL's with no issues what-so-ever. I would have thought with the battery indicator lights on the Arctic, a Quality un-protected cell would have been fine because you would know how far down the battery has been run. Again though, it's an Arctic and we don't know how "reliable" those battery capacity led's really are.
As you already reported, with most protected 18650 cells you can't fully screw the switch cap all the way down on the Arctic. It has really been designed for a 65mm battery. That is one of the reasons I bought the AW IMR, it's a better chemistry that doesn't need any pcb protection circuit to be added to the cell for safety and thus is only 65mm.
I personally haven't tried the Tenergy's yet (ordered) and want to see how well the cap screws down on the Arctic because it's still 2mm's longer than the supplied battery and all other un-protected cells with the exception of AW IMR's. I'll report on this when I get some Tenergy's.
WL sure didn't waste any metal building the Arctic, I mean a couple more mm's couldn't have cost anything; it's so darn tight in there, don't want to damage the spring or circuit it's attached to.
If I was a Machinist, I would simply make a new switch cap for it and w/o the silly safety pin, and then battery length wouldn't be an issue, cause it can be solved that way.
The length varies of protected 18650 have never been a problem for me in all the flashlights I own, or other Lasers.
For now, I have the AW IMR (65mm, no protection required) and the LG (65mm un-protected) All the other batteries I have such as AW 2600, Shoshine 2800, TF2400 Red/Black are all rated very well on the CPF tests and I have been using them in Lasers and a dozen or so LED Flashlights I have, with no issues ever encountered over the years.
With the LED flashlights most any of the brands I have work just fine in them, and the DIY Laser builds; those are were I usually test my batteries. I carry a high output light every day and switch back and forth trying different 18650 cells and seeing how well it holds up for EDC use.
Then come along this unknown brand 18650 supplied by WL and BANG!
Stay Safe