I have 2 Pekin ducks and 1 drake. My girls just started laying at 19 and 19.5 weeks. One is laying soft shell eggs and the others are hard but relatively thin. Both are laying smaller eggs than my previous Pekin did. I fed meatbird to 17 weeks and then switched to all-flock. Should I offer oyster shell or other supplement? Should I feed layer feed? Or is it just something that will work itself out?