Keep in mind, I'm not playin the "fan-boi" game here. I was a die hard builder and it took the local B&M quite a few visits to get me to even try a Kabuki. But I am a technician and I really appreciate when things work well. I've been pretty much using nothing but Kabuki's for the past year and own 4 (2 -510 and 2 - Z2 threaded).
As to the wicking hole issue, that is part of the design. While it may look like the holes are blocked they really aren't. That design helps to maintain an equal vacuum from a full tank to an empty tank. It does however affect how higher VG juices wick. If you were having issues perhaps you were using too thick of a juice. I use mostly 70/30 (pg/vg) and 50/50 juices and I've never had any sorts of wicking issues.
Anytime I've had threading issues, it's been the coil not the atty. I used to get a few coils that wouldn't thread out of a pack but at that time I was buying them from my local B&M. Ever since I started getting coils from MFS I've not had any issues with stuck coils.
Thanks
Glass... yeah well glass is glass, it breaks. With the 4 tanks I have over the past year I've had 1 break because I cocked it while taking it off the top cap for cleaning. Another cracked when my mod tipped over from my desk. And today I noticed my daily carry has developed a hair line crack but that's probably because it was in my jacked pocket when I flung it onto a desk during a service call this week. At least it was just a crack and I didn't end up with a pocket full of juice and nothing to vape the rest of the day
sorry... ramblin... lol