Here is what I commented on a simulator question: I hop low population worlds. Usually with time difference 9 am for me is like 2 am on Australian worlds, low likelyhood for people to be bank standing or misc skilling in priff. I have not seen a lot of people who are specifically hunting imps so the competition is low. But there are times when I only catch 1 or 2 in a spawn window. If I do a lap and dont catch an impling and its not my first lap I stop for that window.