I will now give you an helpful advice for this. Contact others looking and do not wait for an almost cleared group to ask you. I did see another guy LFGing and we decided to join up which each other looking. 2 guys have a greater chance getting attention than a lonely one. And each time we see a Shout we ask them to join. The secret lies in not only shouting but contacting others who shouhts. Only time I needed to shout was when we looked for the final member of specific spot.