I did a 10 gallon irish red that I split into 2 5 gallon batches. I then used US-5 for one and a washed Wyeast London Ale III. I tasted both batches and they seem comparable. The US-5 is clearer while the London Ale III is more cloudy. I understand this can be explained by the differences in flucuation (sp?). The real question is the batch with US-5 doesn't retain the head as well while the London Ale III maintain significant head. Is this due to using different yeasts? Or could it be that I used a keggle and siphoned the wort into my 2 5 gallon fermenters, thus resulting in a slight differences in material in wort between the two. Any ideas?