I think your routine looks good, although I wonder if BT is just a little too late. After the 45min CN, I'd expect him to go down closer to 7:30pm. He may be a bit overtired in the early part of his night sleep and that is why he's now waking at that time.
As for the DF, Tracy thought it was best to give it between 10-11, not later, as later it can disrupt their sleep. I'd try giving it at 10:30/45 for a few nights and see if that makes a difference. If not, I'd just drop it again and go back to feeding him once a night when he wakes. There are lots of babies on here that actually do better without a DF.
What do you think?