How to get an Adventurer rings for 170+ players

Well, aren't there some jobs that don't get much of a boost (if at all) from the rings' critical abilities compared to the lilin's ring? If that's so, just make a character that that applies to. I think that applies to most jobs that lack a natural crit.

Correct me if I'm wrong though.

That only applies to heroes and paladins. For pretty much everyone else, crit ring > everything else.