This is JUST my 2 cents. I'm not a nutritionalist nor do I play one on TV.
I would back off that protein and see what happens. The easiest way to reduce the protein percentage is not to change the feed, but to supplement a larger portion of the diet with cracked grains. If your cracked grain or whole grain mix is a 10% mix, which would be very likely, then you can do the math on the resultant protein of their whole feed program.
50-50 with your feed would average 15-16% protein. 60% feed with 40% grains would average out at 16-17% protein.
Give it a whirl. Try the regime change for a week or two. It could do no harm and evaluate the result. My guess, just my sheer guess based on experience, but still just a guess is that they are gobbling up the high protein feed in hopes of generating body heat in this cold weather. This MAY result in your propensity of getting all these double yolkers. Again, part of what we learn is by trying and evaluating. See how it goes. Note the results.
