hey, i just read this as
my DJ had FTT due to tung tie and reflux. can i ask - are you demand feeding your luca? how much is he taking (before the throw up?) and roughly how far apart are the bottles/boobie?

from my undersanding (and this is just my son too BTW) with the FTT, i had 48hrs of letting him do as he wanted, then 48 of 'control' feeds - which at 2 months ment 100ml bottles every 4hr (or 700ml or something) where as the 48hrs before he was taking UP TO 130ml (of both EBM /FF) i found the second 48hr time frame the reflux became worse, as he became stressed - the thickner made things hard as it was harder to throw up KWIM? i often found that with DJ if i felt him as flat as i could get him and then laied him down on the floor (we had a jungle mat thing with toys hanging down) for his food to kind of 'settle' it helped alot. i also found that DJ wanted bottles more often (they told me 4hrs was 'normal' DJ wanted them every 3-3.5hrs day and night) the thickner also made it like i said harder to bring it up - so he was in more pain which ment more chunder chucking. DJ went from the 10th% to the 25th% once i started 'following' him. now, it may not work for you guys - but i found that if i just allowed him to take the lead, yes there was still vomit - my poor DH would freak out *each* time with how 'big' each chunder was. but he's getting better now (almost 1 year old ) still has days where most of his dinner comes up! thats just how i got though it all, because i found that if i'd have followed what they wanted it made DJ more stressed which ment more spew - but if i have him "more then was needed" he was much more content KWIM? i hope that it helps some.