Formula suggestions ?!! I need help.

My son is currently on nutramigen due to having acid reflux, the only problem is I feel like he has bad gas all the time and is hungry all the time and he spits up. I thought about doing the Enfamil AR which I started today but I feel like It’s to filling, has anyone ever mixed these two? What was the outcome? My son has reflux and has issues I’m just trying to get him comfortable. He wakes a lot during the day from gas as well at night. Any suggestions?