I am on estriol 8mg/progesterone 500mg (+Copaxone, diet, exercise, supplements). The progesterone dose was recommended after saliva hormone testing found I had none of that. Personally I wouldn't be without either the estriol or progesterone, primarily because of their neuroprotective properties.
Clinical trial data on estriol is limited to the initial Phase I trial which was very small. Here's a link to an open access article on: Estrogen and Testosterone Therapies in Multiple Sclerosis
that includes some info on estriol.
There's also an estriol thread
with some info on hormones; and, a thread with info on progesterone
Feel free to pm me if you'd like.
All the best to you