Brown Ale

I racked my new brown ale to the secondary fermenter and got a 1.020 gravity reading. Ugh. I am still not getting the kind of attenuation I want. I'm going to try to aerate the beer more the next time I do it and get a vigorous yeast starter going. The beer still should have a about 5.1 percent alcohol, which is strong enough to be fairly potent, but I was hoping for closer to 6 percent. It will sit in the secondary for at least two weeks and then I'll bottle it. I'd like it to be in the bottle for three weeks before serving it.