Brewed an Oktoberfest with 10.5 lbs of grain and ended up with an OG of 1.030. I tho't my hydrometer was broken since the recipe would have produced around 1.055. After reading a few threads on efficiency it seems as if grain crush could be a huge issue. Checked my spent grain and was noticing a lot of full kernels, and since I had 4 lbs of Pilsner and 4 lbs of Vienna the 1.030 would be fairly consistent in getting nothing from either the pilsner or or Vienna. It was the first time I had used this particular brew shop so not a real surprise. Here's the plan, brew a higher gravity Octoberfest of about 1.080 or higher, and add the weak Oktoberfest to it with the yeast in it and I should end up with ten gallons of good German lager. What's the problem with the plan?