Whole Wheat Sourdough didn't rise 3rd time

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I'm pretty new to bread baking.  I've done lots of reading which I find interesting and have baked a few white flour loaves.  They turned out fine.  I baked the whole wheat sourdough recipe from Laurel's Kitchen yesterday and encountered a problem.  This recipe is entirely whole wheat except for the sourdough starter. The first two rises were fine, but the third rise, in the pan, was a flop.  It rose maybe 50% in 4 hours!  I did bake it and it tasted fine.  I'm wondering if the yeast got too hot during the third rise.  With all rises I put it in the oven after turning the oven on and off for 30 secs.  The 3rd rising period was in the oven for 30 minutes and on a heating pad for the other 3+ hours!  I had the pad on low at first and then bumped it up after an hour or so.  I had a towel on the pad and a plastic container over the top of the bread. 

Her recipe states the 3rd rise will take half as long as the 2nd which would have been about an hour.  I would have expected to see some rising within 30 minutes which I barely saw. 

What most perpexes me is that if it rose fine the first two times why not the 3rd, unless as I said, maybe I got it too warm.

Thanks

Ginny

 

Maybe your starter is not powerful enough yet for 3 rises. That's a lot of rises. I'll have to check her recipe and get back to you.

--Pamela

I received Carl Griffith's 1847 Oregon Trail Sourdough Starter about 2 months ago and have been feeding it every day since then.  It's been out on my counter and has shown what I thought was good activity every day.  I did halve her recipe to only make one loaf.  Cutting it in half I used 175 ml ( half of 3/4c) sourdough starter and 1t active dry yeast (2t for total recipe).

Thanks for your help!

Ginny