My pigeons used to lay in the cold weather.  That is reason I had the plastic eggs to place into nest and remove the regular eggs.
So how many pigeons do you currently have,, with the  new arrivals??    My male pigeons (adult) never chased away any of the offspring males.   Some of those split on their own.   One time, I had 2 young squabs. They were both males.  They believed  in  the rainbow movement, and were always chummy, chummy to each other.  This usually results when there are not enough females to pair up with.   Works same in  female  gender. Hens will pair up with hen when no males available.  One day, both  males split, and never returned on a loft flight.   Most of my pigeons on a loft flight would first  fly to the roof top. Scan the horizon. Then fly laps around the grounds.  Those  2 males, when they decided to split,,,,,,, flew directly out in same direction and quick.   I guess searching greener pastures.
Do you have many aerial raptors present in your area currently??
That is exactly my reason for not having winter (cold weather) hatching.  Peeps with large lofts,,,  that are weather protected,  (walk-in type)  can  have winter hatching easier, and with more success.  
Long long ago,  before I had pigeons of my own,, a friend had a large loft. He heated his with a wood stove.   The loft was the complete second floor of his garage.   The stove was in bottom level of garage.   He also raced his birds, and needed a continuous supply of fast birds.   He did alright.