Cluster feeds // growth spurts..advice?

So my LO is 9wks old and 8pounds now. Shes up to eating 3ozs a feed every 3 hrs but between the hrs of 7pm-10pm she gets so antsy and cries. The bottle is the only thing that seems to keep her occupied but not her full 3ozs only about an oz then back to crying for awhile then shell eat and eat cry eat cry. Her peds said its not colic because shed be crying or fussy all day and she isnt. She has uncomfortable gas and constipation and sometimes makes me think that may be it but its the same time everynight. So i was thinking maybe its the witching hour or cluster feeding..i change her, i give her a bath, i rock her, walk her around, talk to her, do some tummy time, switch off with my SIL to try a different approach and she is just antsy and annoyed and unhappy. Its like clockwork everynight now for a little over a week. Does anybody have some ideas on other things i can try to help her either keep occupied or happy.