Hi Noflush,
I probably can't help much, but the one thing I know is that when I read colon cleansing products that advertise "no psyllium" they usually have flax seed in it and brag about it. I read on one product that was bragging that people who have problems with psyllium,(an avoid for O blood types) can use the flax seed. I'm with you, I see some of the same "mucid placid" stuff, and I've been off the P&B shakes for months. Maybe I'll try it your way of just doing the clay on it's own and continue flax seed in my protein shakes.
PTREE says that flax seed does not give act like the psyllium husks (bowel cleanser) but I find myself disagreeing on that and agreeing with bowel cleansers that use it.