Some of my older girls (21-22 weeks) started doing that "submission pose" last week, and I've gotten an egg every day for three days in a row now. The wait is unbearable but it will be worth it!
I haven't had any problems with other chickens plucking beard/muffs out, but lately one of my 4 week old Welsummer chicks decided that the Polish chicks would look better without their crests. The poor babies are bald. I read that "blue-kote" should stop them from picking at raw spots, so I ordered some on ebay for about $5
Hope you get some eggs soon!