My O'Hanlon timeline is very similar to yours. I will keep in touch as I go along. Just in case in run into any of your clan.
My O'Hanlon's start with my great grandfather; John Joseph O'Hanlon who married Agnes Leahy and had one child at least - Bridget in 1904 in Ireland. Agnes died soon after and John moved to Birmingham, England - remarried (to who, I don't know) and had two more boys - William and ? William was born around 1915.
I realize these names don't mean anything to you - but since we are studying the same time line, I may come across your lineage, or vice versa - or one never knows, there could be a connection.