LoL I don't really search around for my lists I just add whatever I'm reading if I like it and it first a category I've established. Though I admit sometimes I get into moods and I'll go through the tags and see what I can find new to add in and read! And of course people posting suggestions to my lists is always welcome.
It doesn't matter how fast you add things. When you finish a manga just make a list for it or even several depending on what it was about. Then each time you read another one you can add it to those lists or if it doesn't match those make new ones. I've got something like 40 lists and some only have a few on them because I'm still adding stuff. I also make new lists then have to go back and add manga I already sorted into the new ones. It's a good bit of fun once you get use to it.
For me I won't add a series until I get a few chapters into it at least, for some I'll wait dozens of chapters, because a series can be good but have a horrible ending or take a turn I don't like. I won't rate a series until it's complete unless I hated it from the start. LoL Then I rate it so I won't make the mistake or attempting to read it again. hehe But for lists if it starts good then I'll add it, if in the end it turns horrible that doesn't mean I won't leave it on the list. Unless the list is my fave and yeah I hope I don't like horrible things a lot. lol But just because it ends bad doesn't mean it doesn't still contain the category of my list, like it still has vampires or demons or a strong female lead, I just didn't like how it turned out while having those! :) So for me lists are about finding certain tag content more than finding the best stuff. Though I do have my fave lists too by genre. lol
HERE IS MY SALUTE TO EVERYONE WHO CREATE THEIR OWN MANGA LISTS Σ(  ̄□ ̄||)
now I took alook to everyone's list's gooosh it pretty good,I feel soo jealous I don't ve time nor guts to create something like that I rarely get time to read 2,3 mangas in week,and I feel like y don't we've 34 hrs instead 24 hrs it not enough for me urrrrgh*sob**sob(/TДT)/