Naw, not overkill. :) As long as you get rid of the toxins it's not a problem, just don't expect to get as many stones as before, as they might not all have moved forward far enough in the g/bladder to be expelled. I tend to do a major flush (1 cup oil) one week and a "mini flush" two weeks later (1/2 cup oil) and repeat, time permitting. :)