I am making a stout. It has been in primary for 9 days. The OG is 1.079 I used the Wyeast 1728 yeast. It has a 69%-75% attenuation and suggested fermentation temp is 55-75*, which I have been fermenting at 66*. I made a 2000ml starter with yeast nutrients on a stir plate and used an aquarium pump for with a hepifilter for 30 min after the wort was down to 67*. I have been checking my gravity over the past few days and it is 1.40. I have a chest freezer with temp control so I set the temp to about 70*, still under recommendation temp. I also swirled up my carboy to get the yeast back into solution, but after a few min. the yeast fell back out. Yesterday, I went out and got some Nottingham dry yeast and put that in. I have seen only 1 bubble in all the time of me watching it and the temp is 70*. Before I did that however, I racked into secondary. I am thinking that with the 4% ABV in there already, the yeast is having a hard time. What am I missing?
Thank you in advance.