Integration issues.

[ChickenNewB17]

I've been working on the integration for almost two mos with my 16 week olds and 8 week olds. 4 older and 5 younger.
I've read and followed all the rules about integration, been more than patient but still having issues with the big girls chasing the Littles completely out of our yard and into the neighbors. We let them free range almost all day as I am home to keep an eye out. The original 4 girls (well, one is a roo possibly) do fine sticking close to he house and going all around it, over and under porches ect. But when those littles come near they run them all the way out of the yard. Today I kept them all in the barn, bigs in the coop which is inside the barn, and Littles outside the coop where they could be seen.
My question is, should I split up the 4 big girls for a couple of days, only letting two big and all 5 Littles in the coop while the other 2 bigs free range or hang out in the barn? Would this disruption help reset the pecking order? I feel like I need to keep the Littles close to the coop or inside the barn to remind them where home is since they've been run off so often.
The coop is large, has plenty of hiding spots, two water and feeders, multiple roosts...
Night time we have no issues, they do a little shuffling up on the roosts, but once they're settled it's ok. But during the day, the big girls are just bullies. Pecking and chasing. No bloodshed yet.

 

[oldhenlikesdogs]

That's normal. It's better to integrate chicks to adults. Chicks to chicks is harder and takes longer. The two groups will remain separate sub flocks but will be more cohesive after their first year. Don't expect the two groups to ever be chummy.

 

[aart]

Might want to add multiple feed/water stations and hiding places outside too.
Could also alternate ranging to give the youngers some ranging time without harassment. OHLD is spot on with the ages not integrating as well as chicks and adults, until maybe they all start laying, tho same goes anyway they remain pretty separate until younger start laying and work their way into the main pecking order.

Older one at far right does look like a cockerel due to redder larger comb/wattles, tho I don't seen any pointy hackle and saddle feathers, might want to post some side pics in the 'what gender' forum to be sure. If so, he may complicate things as he 'comes of age' (which should be soon) he may try to dominate and mate all the other birds. Might want to plan to get rid of him or keep him isolated for some time.