Spitting up is a pretty normal thing really. If it's not having an impact on his weight gain and he's not in distress when he's feeding or lying down then it's nothing to worry about. Most babies have a degree of reflux just because their muscles aren't strong enough, as he gets bigger it will improve and he will be able to deal with bigger feeds.
If he isn't in pain with it then it's more than likely he won't need any meds, and the things you are doing already will help. Many babies grow out of it when they are on solids and are more upright, crawling can make things worse however, because of the position!
Have you tried a specific reflux formula like Enfamil AR (I think it's Enfamil AA or A+ in the US)?
Laura