Thank you for your service in clearing your pic posting hurdles, OF! I've always been curious to see a dead wick, as I've suspected oil builds up there. I've noticed once the cart starts weighing below the 8.4g mark, the concentrate starts to taste worse, and the potency starts to drop. Around 8.3g, I just consider the cart done and refill or reuse as needed.
On an aside, one of the biggest knocks I've had against the omicron is the rubber mouthpiece. It looks ok when it's new, but after only 10 pulls, it starts to yellow, and with little splats of oil inside, it starts looking downright gross - a huge turnoff when I have the omi out and about with me and have a group of 215 friends to share with. They're reluctant to puff it once they see the brown oil and the stained mouthpieces.
Drove up to vapor den in berkeley, picked up some 510 compatible delrin drip tips. They fit mostly fine in the omi carts, but they bottom out when they hit the bridge, and doesn't quite "sit" properly. It wobbles a bit. Simple fix though, I brought the delrin tips home and milled about 0.5mm of the metal off the bottom. Now it sits in teh omi cart nice and wobble-free, solid and tight, no leaks, great air seal, and best of all, no staining! Got a black one and a silver one, and I find the silver one matches the omicron nicely. Here's a pic for your hemming and hawing pleasure....