Baby’s that spit up.. formula fed. Help!

Baby is currently drinking enfamil AR for spit up. We have told his doctor he spits up very frequently but it isn’t a concern since he’s gaining weight but baby spits up all day. He spits up after eating and even before his next feedings. We do keep him up 30 minutes after feeding. He doesn’t seem to be in pain he’s always very calm and smiley. But I hate that he’s spitting up so much. I’m thinking of switching to a lactose free or organic formula. Does anyone have any recommendations or does anyone else what else we can do for baby? Thanks!