I took the plunge and put LO on Sma staydown on Tuesday! He guzzled a whole 6oz bottle with no back arching, still cries for about a min or so after feed but generally is a lot more happy! His milk intake has increased to 20oz per day on neocate to 29oz on Sma!
It hasn't 100% worked but things are a lot better feeding wise! I'm sure he will grow out of his reflux
Thanks everyone for ur advice etc!!