Bile is actually not acidic. It's pH is between neutral to basic. One perspective could be that you are underproducing bile, which is why you reacted negatively to "fatty" meals. It also could be that the caffeine in the coffee enemas are not potent enough to stimulate your bile flow and to neutralize the acidity of the coffee, therefore also causing irritation.
I'm only throwing it out there as a possibility. I'm not a medical expert, just someone who never had Gallstones but benefitted tremendously from a series of Clark Liver Flushes.