I just finished brewing an all grain batch of ale. I have a question about my gravity readings. My pre-boil gravity was 1.061, and my O.G. reading was 1.065 after the boil. In the past there has always been a difference of about seven or more points after the boil, this time it is only four. Is there a problem with my wort,or is this normal with some beers? ??? Thanks, Cowboy Up!