Formula Milk & Poopoo Not Good

Any suggestions FM that is good/recommended due to my baby having a not so called normal poopoo. Her poopoo soft like a mud greyish & yellow colour. Have tried so many FM such as Dumex Dupro, Lactogen, S26, Dutchbaby, Karihome, Novalac.. any advice. Thanks a lot if you can share with us, mommies!!