Shaking heads...

Any help is appreciated. There is a vet over an hour away but if rather not.
I have 3, 1-2 year old orps who are molting or almost done. Their heads are shaking side to side but not all the time. Their combs are small and dry looking. If I put moisture in it the comb is red. I found a very small amount of blood in poo once. I think only 1 maybe 2 are laying every other day.
My babie( 2 barred rocks, 1 buff orp) from last spring are not molting but maybe getting a couple new feathers. They are shaking their heads but not all the time. Their combs are big and red maybe a bit dry. The girl at the bottom of the pecking order did have diarrhea but tonight her poo looked good. They have been pretty consistent with laying.
I've added booster to their feed. There was some rust in water so I took the rusting peck guard off the water heater.

It's winter where I'm at but we have had a mild winter with 40 degree weather and some rain.

I'm hoping I covered all things but any questions are welcome.
Thank you much appreciated!

Chickens do shake their heads for various reasons, they also do a yawning open mouth move to adjust stuff in the crop as well as the position of the crop. Chickens shake their heads to shake food off and to shake things out of their mouths like hay or stuff that doesn't taste good. Hens not laying will have smaller pale combs. I'm not reading anything to worry about.