sounds like you're doing great! I too, felt terrible when i changed to FF when DS was only 3 weeks old. but you do what you have to do!

i found that bub would fall asleep half way through a bottle if i let him, then want the rest an hour or so later. so now im making sure he finishes it by doing everything i can to keep him awake. also, if he does manage to drain a bottle, i make up maybe 30 mls and offer it to him. just to make sure he's full.

good luck with it all!!