an update:
yesterday i went back to the avian vet and i was shook that the only thing he did is put the poop under a microscope and checked for worms. No gram stain test or anything. He said there is no worms present in the poop but take this medicine to prevent worms.
pretty sure my bird has a problem yet i can't check/test where the problem lies at exactly and by what. So far his weight is staple around 72 ~ 70 which is reliving but i still find undigested food in the bottom of his cage.
I'm really interested in contacting more avian veterans but i don't seem to find any that will put time into helping me and answering my questions. If you know any please send their contacts to me. Thank you!