Poolish is terribly inconsistent
Hi new forum member here. I could really use some advice. I've just started using a poolish in the past 2 weeks and every time I make one I get a different result. Out of the last six times I've made one, only two actually doubled in size or more. Two never rose at all, and two made a valiant effort but basically went nowhere (only as little bubbling) before collapsing. (The photo was overnight after 12 hours, and stayed the same thru the day.)
I opened a fresh package of SAF instant yeast, and I make it identically every time, 100g flour, 100g water and 1/16 tsp of instant yeast. I let it sit for 12 to 16 hours, and a little more if I didn't see any result. Always room temperature filtered water. I have no idea WTF I could be doing that makes this work sometimes but not others. And the room temp is at a steady 70°. Any ideas?? thanks in advance.