Pro advanced to gerber. Spit up issues.

Ftm here. My baby (almost 3 weeks old) started out on similac pro advanced formula. He was fine on it. Pooped regularly, didn't really spit up, burped good, maybe a little gassy but nothing that caused pain. My husband just got laid off, so we applied for WIC. Unfortunately, the wic in our area only cover Gerber brand but they said it's the same thing just different company's make it. So we started him on Gerber Gentle yesterday. We have noticed he is spitting up constantly now. We keep him included for 30 minutes after every feed as I've read that helps with spit up. Should we just go back to the similac brand or will the spit up get better?