Help I think my starter is not well
So Its been 12 days since I started my Pineapple SD starter. After about 9 days I thought I had a good starter going. It would double and collapse in 12 hours. It smelled pretty decent. On Friday morning I fed it a 1:2:2 feeding and it really looks like my starter has really stagnated. After 12 hours I barley had 50% growth and almost no bubbles in the top. I then went back to my 2:1:1 starter and I cant get an explosive growth out of my starter. Lots of forums are saying 3 to 4 hours to get a good double. My Sunday feeding did not grow in the first 12 hours so I did not feed it last night. This morning there is a stench that was there in the first couple of days. I feed it again this morning with a 2:1:1 feeding. Can I get some advice to tell if I damaged the starter. Here are some facts I do know
My Counter top/Oven temp is 71F. This is pretty constant but I have been trying to get it to 75 with boiling water
I am using King Arthur Unbleached All Purpose Flower
I use water from a filter system under the sink. I dont know the quality of the filter but the water tastes good.
On a side note using these same supplies I have made 2 successful loaf's the last two weekend so I dont suspect any thing wrong with the environment or water.