Day 25 of my second LONG MC- discouraged

I'm on Day 25 of my second long MasterCleanse. I did one in April/May for 40 days and lost 50 pounds...I was ecstatic. So..I thought I'd do it again one more time before winter set in. I can stand to lose another 60 and be right in my optimal weight zone but..I've lost only 10 pounds. !
I'm not as hungry this time around, drinking enough Master-Cleanse to keep hydrated is a challenge, I'm doing 1- 1/1/2 quarts a day, tops, plus a couple of quarts of water or so. I'm walking for 15-20 minutes a day, nice brisk walk(I have asthma and haven't been doing other, faster things, because I just can't breathe well). I'm very active at home, this time around, doing tons of projects/chores etc...
I just don't understand, wry smile. My husband says that I slowed my metabolism to starvation mode by drinking so little, but I can't see forcing myself to drink more than I'm "hungry" for.
Anyone else had this experience?

mari