Hi Sabine,
I think dropping the dreamfeed would definitely help, as my doctor said that my son would make it up during the day if I did. You may also want to lower the amount of solids and see if that helps, but it actually looks like your child is getting close to how much milk he/she needs for the day although with nursing its hard to say (even with the reduction). This could also be a phase, just to throw another wrench in there.
As for dropping the dreamfeed, this actually went much more easily than I thought it would. Dropping the amount is ok, but I ended up giving the dreamfeed earlier and earlier. The doc also saw no problem in us just dropping it but I was having a hard time getting my son to take enough formula so I was hesitant. Anyway, it was almost as if my son weaned himself from it. He goes to sleep around 6:30 and ended up waking at 9pm one night, so I just decided to DF then - he slept through the night. Next night, I went in at 8:30, he ate and slept through the night. I think I did 8:30 for the next couple of nights and same result. Then he woke about an hour after bedtime, I fed him then and he slept through. This was nice because I was confident he could do it and defnitely didn't need the food. Anyway, then I just stopped and it's been several weeks to a month now. No problem.
I hope it goes this way for you if you decide to do that! GL!
Caroline