Loose stools are normal. I am combo feeding right now.
I am doing the same , only producing about 2 oz per feeding but baby will take 2-4. I am now having grainy mustard poops but loose stool is perfectly normal !
Using enfamil neuro pro
Try similac 360 total care
I'm not sure about formula poos, but breastfeeding poo is VERY loose and usually orange/yellowish with little white bits. If you're combo feeding, I wouldn't be too worried about the loose stools!