The unhinge move can help hook it less in 2 different ways.
Geometrically, if you are hooking the ball, you have a clubface that is excessively closed to the path. The unhinge (ulnar deviation) opens the club face, which helps your hook pattern. Secondly, unhinging widens the arcwidth. Getting the arcwidth wider longer tends to slow down the rate of club face rotation. While the wider path can make the path more in to out if you don't balance it with body rotation, the unhinge has a big impact on the face getting too closed.
Anatomically, ulnar deviation makes it harder to extend the trail wrist. So, ulnar deviation often creates a feeling of stability of the clubface. There is probably some level of connection between unhinge amount and timing and accuracy, but more than likely, it's a big anti-hook move so it quickly helped balance your personal pattern quickly :)