FTM:Advice needed on if we need to switch formulas

Hello! I am brand new to this subreddit, so my apologies if I am navigating this the wrong way.

My baby (7 weeks) is mostly formula fed with a single 4 oz bottle of breastmilk we started in similac 360 total care ready to eat, had a long stretch of no pooping, and now are on similac 360 sensitive total care ready to eat three weeks ago. While the poops have started flowing again, she still seems uncomfortable. She has lots of toots that she works hard to let free and she’s become harder to burp. Sometimes, after she’s done feeding, I wonder if the formula is giving her some heartburn. She’ll cough a little or maybe act like she’s chewing on something. She’ll also get really intense hiccups after big burps.

I was wondering what more experienced parents think. Does this sound like it’s time to switch again? Or is this just normal baby things? If it does seem like I should switch, any recommendations on brands?