As others have said; the spit up only really becomes an issue if your babe's not gaining weight.
My son was terrible with spitting up; all the time every time he fed. BUT he doubled his birthweight in 2 months and is now a very healthy 18 month old.
So as long as he's gaining weight, you probably don't need to be overly concerned apart from the fact that you'll be doing a ton of laundry and a half