S.B.
Not all spit up is reflux. Is he fussy/crying? How are his feedings? How is his weight gain?
There are things that you can try before changing formula. Perhaps he is eating a little too much at each feeding and his little tummy is just over full. Placing him in that gentle incline for 20-30 after feedings may help. Not doing tummy time until it's almost time for the next feeding may help keep him from spitting up while on his tummy.
It could be the little muscle at the top of the tummy just needs a little more time to mature to keep his food in his tummy.
Every baby is different. Reflux can be serious but babies can be "spitters" without it being reflux. My fifth baby drenched me after every feeding. My doctor suggested trying smaller feedings. She was in the 95+ percentile for weight. Once we shortened her feedings she quit the spitting. If your son is healthy and his weight is Ok you try some coping techniques before changing formulas. The changing formula thing can be a long expensive road.
I wish you well,
S.