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I thought about putting batteries in there, but would have to do so in a way that they don't bounce around. How'd you stow your batteries?
As for the lack of comfort with the Ops Core; I have a long face and even after adjusting the rear so it sits at it's lowest point, the chin strap can not be adjusted so that the tension is even. It's too loose along the jaw line yet tight with the vertical straps or vice versa. Due to the shape of my head, the chin strap doesn't allow proper tension thus causing the helmet padding to press one side of my hide more than the other. Even after moving the pads around (both 1/2" and 3/4"), I can't get it to sit well.
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The height of the rear nape for the Ops-Core suspensions (at least the ones with the fit bands like the Occ-Dial and Worm-Dial) doesn't necessarily have to do with the shape of your face so much as the shape of the back of your head, so if you adjusted it low just to get more slack out of it, it may not be adjusted in the right place.
The rigid nape definitely has to be positioned correctly in order to allow it to sit comfortably on your head, and a misadjusted nape can cause a lot of discomfort.
I've found the easiest way to adjust the rear nape is to loosen the screws to adjust the height of the nape just enough so that they still have some friction, but can be moved. I then place the helmet on my head with the chin strap unbuckled, and tighten down the suspension until the rear of the nape "cups" the bottom of my skull, and I'll usually do some neck bends/rotations to make sure it's comfortable in all positions, particularly looking straight up (as if in the prone). I will then gently loosen the fit band just enough to be able to remove the helmet without causing the straps to move, then tighten the screws down so it no longer moves.
This may or may not help with comfort, but IME, proper adjustment is a critical first step with Ops-Core helmets that a lot of people forget/omit when getting the helmet set up. The softer nape of the TW is a lot more forgiving than the Ops-Core's rigid nape.
As far as liners/pads, I am personally a big fan of the Ops-Core Lux Liner over retro-fit pads, as the full foam inner shell offers a lot of blunt impact protection, but it does make the helmet a little bit smaller inside.
~Augee