Bag slapping yeast

[leadhead]

Following BS2 recipes, the yeast recommended is often of the bag slapping variety. (only availability from my supplier)
Twice I have used it and twice I have suffered stuck fermentation.
Since they seem to be widely and I assume successfully used. What is the secret methodology to get it to work.
My FV temps are fairly well controlled, though not yet cabineted.
Quite expensive stuff to waste!
Any assistance appreciated.

 

[BigYin]

which yeast is it?

Can be a variety of problems that lead to stuck fermentations - see the link in my signature below to a more comprehensive discussion on the subject :thumb:

 

[leadhead]

Wyeast 1007 - German Ale & Wyeast1318 London Ale.

 

[zgoda]

Never had stuck fermentation issues with these 2.

Did you make fermentation test to know how far can it go? It's always worth try. If this is a constant issue I'd suspect faulty thermometer. Few degrees up and you'd get much less fermentable wort.