J.S.
So one other you might try, which we did at this age although we were breastfeeding but the same principle applies. In addition to the "tanking up" approach you are trying to apply by giving her some more @8, I would also give her a dream feed before YOU go to bed. You do it without waking her up, you can activate the sucking reflex while they are sleeping and she'll take a little more. This is form the Baby Whisperer (Tracy Hogg), and like I said, I did this for months successfully. My little one also slept through the night most of the time at that age & I believe this was a factor.
Congrats and good luck!