To be perfectly honest, in my experience, the df works for some and it doesn't for others.
My suggestion is to give it a week at least. Perhaps your supply wasn't used to feeding at that time or maybe it will just take your lo a bit longer to get used to it.
I know when I initially started the df it didn't work for us for the same reasons, but the next time we tried, it worked wonders. We have been doing it for months now.
If it doesn't work after a week, perhaps try cluster feeding, although this is just an uninformed suggestion.
HTH.
If you are still having troubles, please let us know and we'll do our best to help you out.