Is this where your poorly Orps are from?
It might not be the case but because your hens are poorly I would be cautious about reccomending at the moment.
It could be related to the gene pool and breeding management of your supplier.
They could be fantastic, but my alarm bells are ringing.
I hope this helps.
Unfortunately I have lost out due to less than scrupulous breeders of fancy hens and rare breeds in the past. You can spend a lot of money and collect a lot of heart ache.