Vomitting is pretty common and usually isn't a problem (apart from the mess and all the washing which I know is a PITA). One of my DS's was a happy chucker for months.

Many mums have an oversupply of milk at first, and a faster flow, until the hormones settle down, so it is quite possible that this will settle down on its own over the next few weeks. It is also easier to overfeed with the bottle as they can't stop drinking easily when they are full like they can at the breast. My thoughts on this though are if it ain't broke, don't fix it. If he is not distressed then it really is just a problem of mess and washing, and trying to change things when everything else is going well could introduce new problems. Perhaps see how he's going in 4 weeks and then maybe look at changing things if it's still happening. I know the vomit can be distressing to see as mums but if baby is happy then that's a good clue that it's nothing sinister.