Let's break this down:
122, 171, 191, 266 - A continuing theme of 'town should/shouldn't be doing this!'. This is something UCV does when he is scum.
171 doesn't actually say this. Neither does 191. 122 and 266 do I suppose. Assertion that this is something UCV does as scum (and not as town) is unsupported. I've seen plenty of people talk this way as either alignment so if you’re planning to argue that this is scum meta, you need to show that he does this as scum and not as Town.
129 - Completely fake scumhunting. Looks contrived with one townread, one null read, one scum read, and no real reasoning for any of it.
This post is 19 minutes after he replaced in. It's a wonder he has any reads at all, especially if he hadn't read the thread before posting. A couple of gut reads at this point does not seem unreasonable.
Given only three reads and three possible alignments, having one read of each type is actually the most probable scenario by pure chance.
141, 143,152, 155, 199 - Buddying me. As I explained before, he knows I know his meta well and that I tunnel on him once I catch on that he's scum, and he entered into this game with the plan of trying to appease me, no doubt about it.
141 does not look like buddying to me. I guess 143, 152, 199 could be construed as buddying. 155 does not look like buddying to me. I get more of a LAMIST vibe from UCV's posting, both here and in some of the ones up in 122/266, though you have not demonstrated that this alignment indicative.
146, 147, 174 - Fence-sitting. This is something I know he does as scum.
None of these appear to be fence-sitting to me at all. He appears to be saying something is NAI. In either case, you have not demonstrated that he does not do this as Town. More generally, the problem with a lot of this read is that you're saying "I know he does this as scum", but unless it is something he does only, or at least, much more often, as scum, it isn't a particularly useful tell.
159 Asking if Impede's play is lurkscum; why can't he judge this for himself?
This doesn't look particularly alignment-indicative to me.
189 - non-committal and unexplained reads list where he gives scum leans but says he has no solid scum reads, but is apparently 'still hunting'.
This is pretty much the only point in your case I agree with.
222 - Responds to my vote on him for buddying with a further attempt at buddying, saying it's good I don't always consider those who side with me as being of the same alignment. He's also using emotion here to try and get me to change my mind.
Okay, how is this alignment indicative? Would Town!UCV not also want to change your mind here?
Other stuff...
My gut is that replacement/ragequit is usually more Town-indicative than scum, but I don't really have a good enough sense of the site meta here to be able to say what the replacement meta is here beyond that people replace out here a lot more willingly regardless of alignment, than what I'm used to.
I feel there is enough to warrant a UCV lynch even if you entirely exclude meta. Just note his reaction to being voted - he isn't angry because I'm tunneling him, as I've been doing it for a while this game without him getting angry. He's annoyed that it's working and that I will successfully get him lynched again.
My impression is that townies get upset about being mislynched more often than scum get upset about being justifiably lynched. Excluding meta though, I’m really struggling to see a case here.
If we shouldn't lynch UCV then who should we lynch instead?
Lucky, Zaraki, you, Zulfy, or Impede would all be decent choices. Putting this all together, I could probably get a scumlean out of this. Generously, I'd say that it's about a coinflip that UCV will turn up scum.
Why is Lucky's argument with me earlier in the day relevant to him voting UCV?
I find it odd that he would be so willing to sheep your case without question when he so strongly disagreed with you on principle earlier in the game.