Dr Browns was good when mine refused the mam ones at 10 weeks
One thing you could try is mixing some expressed milk with the formula. I did this with my first baby so it was more familiar then reduced the breast milk over time so she got used to it. I was just getting her to take 1 bottle a day though.
Maybe try the faster teet on the mam bottles as formula is thicker than breast milk so baby might just be struggling to get it quickly x
I use lansinoh bottles when combi feeding now he’s fully bottle fed he still has them. They were best to avoid nipple confusion when I was breastfeeding, so your little man might take to those better if he is being weaned from the breast!
Following cause my little boy is exactly the same! And I need some sort of routine as I'm back at work a couple of evenings later on in the month. He also used to take the MAM bottles but now won't! I've just ordered some Lansinoh teats as I believe they fit on the MAM bottles so hoping that will make a difference xx