Hey BB!
When i went from 12 oz (as the box directed)until yesterday down to six, my movement was the best yet after day 1 and 2. I'm on day 6 (yeay!!!) I've also been gradually steeping longer and longer, and am now steeping where you are at, 20-25 min.
I'm not using smooth move, i'm using Luci De Beau "dieters tea" (but it is senna leaf.)