I have a potential issue. I fermented 4 gallons of pale ale at 62 degrees using white labs 002. I made a starter and everything seemed fine. It started at 1.051 and stopped at 1.021 after I racked to secondary. That's only about 60 percent attenuation. I was hoping it would go down to about 1.012 or so. Should I leave it be or repitch with some us-05 to try to bring the gravity down some more? Is lack of oxygen an issue for repitching? My experience with the 05 is that I get a lot of what I believe to be acetaldehyde. And it takes forever to mellow out. I don't get that with the British ale yeasts however. I would love some advice on this issue. Thanks.