Really need some advice

Sorry to address this again but I am really having some problems with bullying.

The story so far, pecking order of the oldies Rosie, Penny, Geraldine, Bella. I introducted Daisy and Lily by keeping them seperate within the run on 22nd August, last Saturday 29th we let them run together in the walk in run.

No major fights but there has been a bit of comb pulling and a worrying amount of feather pulling and this is mainly from Bella who was bottom of the order before.

I have put vaseline on Daisy's comb but she almost has a bald head where Bella is pulling her feathers out. I have now put some vaseline on the feathers around her comb in the hope that Bella wont be able to get a grip.

Should I seperate them all out again or will that just put it back to day 1 when I put them all in together again? I can't free range them so that's just not an option to help with the introductions.

Rosie, Penny and Geraldine have the odd nip or stand off with them but it's Bellas bullying that really upsetting, Bella is still getting picked on occasionally by Rosie.

They are all ex-batts and are in a 15 x 6 run with perches and dust bath. The new girls move away from the many food stations when the others home in on them and this seems to stop any further advances but Bella is relentless and I guess she has worked out that Daisy is going to be bottom of the order.

Please - what should I do, this is heartbreaking!

after 10 days ours all settled down, as long as there is no blood drawn I think they will settle soon.