No offense intended to others re: amount of formula your baby should be having, but follow your baby on this point rather than other people. Our DS has always had 'too much' formula in the eyes of some people. He is a healthy weight - around 75th percentile, has followed the chart pretty much consistently since birth. He isn't fat, doesn't bring up feeds, and is very happy. He is very active and always has been so I get the impression that this might add to his hunger. Since 5mo he's been having 4x 8-10oz daily.
We had a very similar situation at 2wo (1wk attempting bf, 1wk attempting combi, then went full ff, for various reasons also). In the beginning he quickly went from 1-2oz per feed to 4oz (around the 3wk mark). At 1mo he moved onto the larger bottles in order to have 4-5oz per feed. He would also get grizzly after feeds in that first month and that was largely down to trapped wind. We used Infacol and Dentinox (not at the same time, tried one after the other). They worked, but worsened his reflux so we had to stop them. We did bicycles with his legs and tummy massage which helped a lot with trapped wind. Also bringing his legs up gently towards his chest. Once he was 1mo we used gripe water by putting it into his bottle. By far, the very best solution for us. Weaned him off at 5mo as it was no longer necessary.
However he would make it known if it was hunger - harder to pacify, trapped wind exercises not so successful. In which case we offered him an oz or two more. When he consistently wanted more we upped feeds. We followed a 'demand' approach despite being ff - maybe I'm missing something, but I don't see why it should be majorly different from demand feeding whilst bf. As I said, has worked very well for us 
Finally when he was tired (and this is still the case) sometimes he just cries to sleep, no matter what we do. So it could just be your DD's way of settling for now.
Best of luck to you and your baby!