Personally I'd stick with Dr Clark's recipe. Abstaining from fats on the day of the flush allows the bile to build up some pressure that the ES and oil/juice mixes release to push out the stones. Not to mention that if you are having gb attacks fatty foods like cream etc. are the last things you should eat.
If fact I can't wait to get home right now to take a light dose of ES/gf juice to knock down this mild attack that just now started. You guessed it friends, I had too much fat for lunch, left over pizza, 3 slices of pepperoni and ground beef. Flush # 2 this weekend. :-)