I agree with winemaker 3352, Blackberry is high in malic acid and 71b is the best at eating up some excess. I also agree with just about every post on here in the fact that CDB works very well with pulling through the most fruit flavor and doing so by gently fermenting with very little foam up. That being said I too use both nutrient and energizer in all my fruit wines as most lack in these areas unlike grapes and even with them I use nutrient. I do use Pastreur Red quite often in my darker fruit wines also as it does a great job with pulling fruit also but in addition it also gets better color extraction. It ferments a little bit more violent then I like for my more delicate fruits like light fruits such as apple or peach. I mainly use the Pastuer red for Black Currant an Blueberry and Cranberry.