If the basic theories are correct - that vitamin C bowel tolerance is based on metabolic need, and how much vitamin C the tissues absorb from the blood, then your C tolerance dropping is a good sign (as is feeling "so well.")
I was interested to read in Dr. Levy's new book DEATH BY CALCIUM, they he personally did regular C-flushes (a program developed by Prof. Russel Jaffe).
This might be an exercise for you to try weekly to compute your current acorbate tolerance (and to detoxify, as the Cleanse/Flush is designed to help with heavy metal and other toxicity)
The idea is to take a maximum one-time amount of vitamin C you can usually handle, from 1 to 10 grams, every 15 minutes.
Jaffee recommends sodium ascorbate for the calibration. I do not see why ascorbic acid wouldn't work as well or better.
There will be a watery discharge (diarrhea-like), usually between hours 2 and 3.
The amount of ascorbate taken to produce the discharge is considered the Calibration level, and Dr. Chong and others claim that Jaffee recommends a daily amount 75% of the calibration. So if your calibration was 40 grams (40,000 mg) then 30,000 would be your recommended daily vitamin C intake.
Jaffee says that for the purposes of detoxification, bowel tolerance is too little too late to force the body to expel toxins.
We can also use the calibration to help determine a good daily amount for the week.
Owen R. Fonorow, Follow #OWENRFONOROW at twitter