How much room is there after an offer? - 14 months and counting

I want to negotiate but I am afraid they will withdraw. There are 11 people counting on me, so I am trying to be careful. The hiring manager was friendly and open. Did you negotiate?

If they say no, consider asking for something else, such as a review in six months.

I thanked them and said I was excited but hoped we could talk about the pay. They came back with a bit more.