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If your birds are young, they won't start laying really large eggs until they're about a year or so. Mine didn't start laying really huge eggs until they were about a 1 1/2 years. Occasionally, I'll get a double yolker that the size of a small torpedo!
One thing I have found with Jersey eggs in regards to hatching in the incubator (and I even read this, so it's true): The eggs are so large, that it actually takes an extra day, sometimes two, for the chick to finish developing. It's so large, it needs the extra time to fully absorb the yolk sac.