Hi Sherark
sorry to hear
did the vets do a poo sample?
it could be Giardia which is SO common.
Giardia is a water born parasite found in all our drinking water supplies from the tap.
yes bengals are quite notorious for their tums and Giardia (which is in all cats guts) can flare up especially at moments of stress ie moving to a new home and settling etc.
it is treatable normally with an extended doseage of panacur paste (5 days instead of 3)
the pro biotics will put the good back into them!
some breeders will only give bottled water or filtered water for drinking.
how far are you from the breeder as it could be the water supply if you are giving tap water?
what are you giving? what did the breeder give? did they give you a diet sheet?
lots of questions but been there too!
have you changed diet totally from the breeders diet? i know you said about the raw,but a total overhaul can do the same.
diet changes can take time to sort them selves out too.
there is also the allergy side of things, some people swear by a wheat gluten free food for their cats (denes). so that is something to contemplate as well.
good luck