So a few weeks ago I started brewing a robust black onyx porter (also steeped vanilla and oak cubes in bourbon as well). After brewing my starting Gravity was 1.070. Two weeks later when I went to move it to secondary the final gravity was only 1.030. I was told by the local brew shop that the yeast I was using (whyeast 1028 which I pitched using a starter) and the amount of malt I was using should give me a target gravity of about 1.010 (ABV of about 7.5-8%). But I fell very far short of it. Is this something that might change in secondary? Or did I do something horribly wrong?