Wow, I'm glad I'm not going through what you are! I know of no easy way to integrate except to have two separate coops and runs. Which I do. I have my "original" flock in coop one which has a nice 30'x20' run attached. I have a fenced off area for free ranging that is about 65'x50'. So when they leave the run they are still "enclosed". I obtained 4 Delaware hens from a neighbor that moved and I put them in coop and run number two. I didn't let them out for 2 weeks. That coop is smaller, but the run is bigger, probably 35'x35'. I would let my original flock out to free range and they would look at each other through the chicken wire. I finally let them all out to free range together. There was some chasing, but no catching and no fighting. It took some time, but now one of the Delawares has moved into coop one! And two of the original flock has moved into coop two! The two from the original flock that moved into coop two are at the bottom of the pecking order. So I let everyone go sleep where they want and it's been interesting to watch them get along and move around. Good luck with your flock. I'm sure with time it will be fine.