I wouldnt recommend using any products - i tried infacol with DS1 but made him worse over time! You have to give it before every feed as it has an accumalitve effect and I think they become dependent on it.
DS2 (5wks) is fully BF and is a really colicky baby - dont know when colic becomes reflux but i dont think he is as bad as that.
you have probably tried many of the same thigs as i have so dont mean to be patronising, but these are some of the things that i do.
when winding him, sitting him up on my knee to pat him seems to work best and laying him on his back and gently pushing his legs up helps get out trapped wind.
He likes being on his tummy, so during the day I tend to put him on his tummy to sleep when unsettled and when the night times have been really bad, i have also put him on his tummy until settled & then turned him back over.
I also carry him on his tummy, across my arm, head by my elbow if that makes sense, hand under his tummy/crutch
Straight after a feed I keep him upriht for atleast 15 mins either on my shoulder/chest or sit him in his chair/prop up with pillows
he also gets quite violent hiccups and a dummy seems to help (if you are bf make sure ybf is well established as it may cause problems with latching on)
on the positive side, they do eventually grow of it.