Hi everyone - I've had some brilliant help from these forums already and have returned for your tips and thoughts

My LO is 22 weeks and she takes 800 ml on average a day (formula fed). I think I need to tweak her feeding routine to encourage her to drop her night bottle but am unsure how to do it. On average she only takes about 60 ml at around 2am so it seems like comfort not hunger. I try and DF at around 11 pm but she tends to take only a little 40-80ml. She's also started waking at other times in the night and has trouble going back to sleep (trying some PU PD). Her days vary a bit but go something like this:
E. 7.00 - 7.30 (awake 6.30 average)
S. Btw 8.45/9.00 on a good day until 10:30 or 11.00 (wakes after 40 mins and settles herself after 10 mins or so)
E. 11.00
S 13.00-15.00
E 15:30
E 17.30
S bedtime sometimes at 18.00 depending on timing of 2nd nap as she tends to resist a catnap for the 3rd nap
E 23.00 (but sometimes earlier as she wakes anytime from 21.00 onwards if she didn't take much at the 18.00 feed)
Any advice would be great. I'm worried her night waking will only get worse unless I can tackle this soon but I want to be sure she's not hungry at night by getting her to have more in the day.