Perusing Hoopdata this evening, I noticed that the Hawks have had a lower eFG% than their opponents in each of their last 25 losses and in 27 of their 30 losses this season. The three exceptions all came prior to Thanksgiving: at Dallas, in the home loss to Utah, and in the first visit to Orlando.
The Hawks have had a higher eFG% than their opponents in 31 of their 39 wins.
So, when the Hawks shoot better than their opponents this season, they're 31-3. When they shoot worse than their opponents, they're 8-27. In 17 of the last 18 Atlanta Hawks games (the exception being the come-from-behind win against the Bulls), the team that shot better won the game.