I have just started a lager kit that someone gave me. it did not have a packet of yeast so I thought I would try one of these Lager yeasts. So I brought Saltlarger Larger yeast I brought a 11.5 gram pack and the larger is at 16% in the FG . On the yeast packet says that 11.5 is good enough for 15 litres but my brew is is 23 litres should I buy a other packet of this yeast? or is what I have OK? I had a look at the brew just now it is fermenting well. I also have a Coopers European larger should I replace the yeast which I get with that kit with a lager yeast