Yes, it is tricky but yet simple if you find all the info that works.
I agree to rehoming the Reds.
Will take a few weeks of look but dont touch again for the new hens to fall into a pecking order with the established hens.
Once you do let them out their will for sure be some chasing but it usually goes better if they are let loose free ranging.
Edited by chickens really - 6/9/16 at 1:07pm