Hi Again everyone

Just finished reading back in the post... Looks like everyone is enjoying the warm NW weather

We had to build larger pens over the weekend because we cant let our chickens free range anymore due to neighbor hood dogs

Will be OK because before summer is done we plan to fence our entire garden area off so the chickens and bunnies can all be protected behind a big field and electric fence
Since everyone had to be in their runs in this heat.. I did a couple things that the girls seemed to love... I halved a watermelon and froze it... They loved it.... as it thaws it gets mushy. Also I freeze veggies into water.... makes little blocks.. Great way to get them cooled off and a bit of extra water PLUS since they are in the runs it helps with boredom.
Now I have a couple questions and hope to get a bit of advice from you all.
First I keep seeing the term "Straight Run" in some post... what does it mean?
In one of my coops I have just my RIR and Barred Rock girls.... It seems my Barred rocks are being mean to the others.. picking at the some to a bloody pulp. I have to remove them an let them heal up and then go thru a whole process of reintroducing them to the coop and run again. This last spring I tried adding 4 new girls to the group... They were full grown RIR... I added them in the run in a separate little wire pen I let everyone "chat and visit" for a week... Then I slipped the new girls in at night into the coop... all seemed fine.. Then 2 days later .. I found 2 of the new girls dead and the other 2 badly hurt and hiding

So I removed them and nursed them back to health... made them their own coop and pen out of a 8 ft dog kennel.. and one by one took my Original hens and added them to that pen over the course of a week... ( That was A LOT of Work and time) Everyone seemed in perfect harmony so about 2 weeks ago one night I moved all back to the Main coop... Low and behold 2 of my RIR are" all beat up and naked butts" That description courtesy of my 3 year old neighbor girl. I have tried the No Peck lotions and sprays and no avail.. Once again I have made another small coop for the 2 injured...
So thats my story and Im sticking to it

Seriously though I am wondering... Is this a normal chicken behavior that Im gonna have to keep dealing with??? Is there something I could do differently to fix this discord?? My other Coop is a mix of several different breeds and a Roo ... they all get along lovely.. I d really like to add to my girls and try some other breeds but Im scared to death to try..
Any insight.. advice...is welcome .... Thank You..