Fussy while feeding

RDH+1
I have a 6 week old reflux baby who is now medicated and it seems it has settled. 
However, she still only ever drinks 1-2 oz at a time and then she simply sucks it into her mouth and spits it back out. She is still hungry though. I have to stop her and force her to take a break for 10-15 mins before she will swallow properly again.  Feeds take an hour or more. 
This has been happening for weeks. We have tried 6 different teats of varying flows. 
Any ideas? 

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