can understand your feeling. My boy also dislikes bottle. his is on 2hr intervals and max only gets 60mls from bottle, while i am at work. (at 5 months) i keep worrying that he does not get enough. so i can only nurse him more through the night
But my pediatrician told me baby will know how much they need. if they are not getting enough, they will nurse more...
about your supply, you nurse full time and pump part time ? if so, whatever you pump out is actually extra that baby not taking, so not to worry so much.
If you wonder why you are not feeling engorged, maybe can refer this site..
kellymom.com :: My breasts feel empty! Has my milk supply decreased?
is your baby teething? i notice that my baby also refuse to nurse and takes very little from bottle when he is teething...