I would simply use the Epsom Salts and not be afraid of it at all. Having done that Robert Gray protocol for such a timeframe and now moving on to the Liver Flushes you are in an excellent position to really clean things up.
I guess in my mind, the Epsom Salts are the guarantee that your colon is going to rid itself of anything toxic your liver dumps out. As I progressed with the flushes, I found that the 2 doses of epsom the next morning were key in unloading what was expelled from the liver/gall bladder.
I'd give it a shot in 2 weeks and tell us how it goes!