are you 50% there (day 5 of a 10 day cleanse) or going longer? My body hates the SWF (Salt-Water-Flush) so I use the tea morning and night and it works fine for me. In the end, you have to do what works for your body (and if using the SWF (Salt-Water-Flush) in the afternoon works for you - go for it).
I'm no expert but I heard it's not wise to use the P&B shakes while on the MC.