You will find the best results is to only hand feed peanuts to your birds as a treat. It makes handling your birds much easier especially if you have homers which is all that is in my flock.
Here is a video done and me and my grand daughter and our hobby.
Not a good idea chickens have a tendency to swarm anything foreign in their coop and kill it especially a fantail where they are poor fliers.
You seem to be doing everything right in the feed department. I am unable to acquire pigeon mixed feed in my area and like you resorted to your method of...