Lich is a pretty chill server, I've seen the same few people coordinating server-wide hunts for A and S rank hunts. People almost always wait to pull unless it's early morning server time (it is an EU server, i'm from NA so that's when I usually play).
Not too sure about coil, just cleared T5 myself but I have no static coil group. I don't see too many people with dreadwyrm stuff very often, though, who knows... I don't check religiously of course.

If you want a slightly more active server then maybe try Ragnarok? It's the EU legacy server and I hear good things about it.