Quite a few have read your post, but unfortunately no replies so far.
Whilst I have no Chambers in my own lines, I have in the past undertaken a little research on the name Chambers for someone else, but unfortunately they have not had any DNA tests done.
Their Chambers goes back to a Thomas in County Down in early 1800s. Little known about Thomas (probably born c 1810-20), but at least one child's birth registered at church in Ballynahinch, County Down in 1840s. Possible links to Magheradrool and later to Donaghcloney and Seapatrick Parish.
Realise this is not what you need, but thought I would post anyhow, in case it means anything to other Chambers researchers who may happen to look in on your post.