The added length of travel and weight induces you to torque the grip in double action. Recognize this and train yourself to isolate the movement of your trigger finger from the remainder of your fingers and hand as you pull the trigger. In other words, concentrate on tightening the trigger finger without tightening the other fingers.
For target accuracy, you can learn to stage the hammer in double action. Some guns are better at this than others, S&W revolvers do this especially well. In other words, you learn to pull the trigger until it is just about to release, pause a second, exhale as you pull the trigger the last bit to release. This way it is similar to pulling a trigger in single action.
This chart can help you determine what you may be doing with your hand depending on what quadrant around the bullseye your bullet is striking.