It is very unlikely that your flush results had anything to do with the color of the grapefruit. If anything red grapefruit is preferred over white by some, but that's kind of iffy.
You sound pretty good -- not like the usual person with CFS. Maybe like you said you're having a good day. FYI, Chronic-Fatigue-Syndrome is often contributed to or caused by reactive hypoglycemia, low thyroid and/or low adrenals that have not been correctly diagnosed. The liver and gallbladder can also play a part, major or minor depending on the person.
Glad you're enjoying your experience. I hope that you are able to flush every other week until you are clear.