That's very unusual. Are they still rather young? Maybe you need to be feeding heavier. Sometimes with breeding issues a human grade vitamin A can help but I don't know if it applies to clutch size or not.Wow I'm jealous of all you guys with big clutches. My Iquitos vent's biggest clutch was 3, but the biggest that developed was only 2. They typically only lay one at a time, sometimes two. Hopefully they will bulk up in time.