Mixing formula

I just switched my son to Similac Alimintum he’s almost six weeks the reason for the switch was extreme constipation and suspicion of silent reflux prior to this we had him on similac sensitive, for gas. The problem is the sensitive didn’t help his gas at all, so we bought Alimintum thinking maybe it would help more. He cries all day on Alimintum I think it taste bad to him, but it’s helped his gas. Since I still have some similac sensitive should I use say one scoop of each in a 4oz bottle to help with the taste? Or is that bad news?