I have to say that I do agree with the anons above re: activity, but since they've all pointed out a lot of things (and my understanding of your plurk is that you talked things over with JL) so I'll try to be brief and just say that if your issue with continuing threads is "oooh shiny" and you know that's an issue of yours, all the more reason to implement a system that doesn't boil down to "other people poke me". Things like the anon directly above me said, such as folders for notifs, or threads, or a word .doc that lists all your threads.
We all get selective sometimes, and no one is blaming you for occasionally wanting to tag one or two threads, but I have to agree that it has seemed to be a problem since your joining. Maybe try something where you doing stretch yourself too thin (for example, you do post often-- and it's awesome that you're inspired to play your characters, but maybe spreading it out would keep the tags from piling up). Also, recognize when a thread may not be going anywhere and drop it in favor of something that could lead to deeper CR? (For example: a thread between Character A and Character B which is basically just 'oh how are you' 'oh I'm great' vs. a thread between Character A and Character C that are discussing canon things or going into the forest together, etc).
Being in so many threads for so many months will ultimately bog you down a lot and sometimes knowing when to let things go (within reason) can help free you up to tag new things and hopefully get some momentum going so there isn't the period of several weeks between tags (or, in some extreme cases, as much as a month).
I'm super sorry to give another comment about activity... I know you've gotten a lot this round-- but I really wanted to give some suggestions and hopefully this doesn't come across as rude or accusatory because it is certainly not my intention.
Beyond activity... I just wanted to say that your characters are fantastic. I think you handle Kamui so well and it's clear that you know and are comfortable with his character. He's snarky at times which I find amusing, but overall you can see how hard things are for him and how completely he cares about Kotori and Fuuma. I should also mention that bb Kamui is probably the cutest thing ever. His thread with Kotori was making me grin like a total idiot.