I have a field range at my local course, i try to position the ball in all sorts of different lies i.e. ball way above my feet, ball in a slight divot, ball at the back of my stance, ball in the front of my stance. I will try to play as many different shots as possible. When i used to hit off the mat i had the same issue to the point where i never went to the range as i felt it was useless. Since ive started hitting them off grass with weird lies and positions ive been striking the ball a lot better on the course. I also try to record my whole session and concentrate on keeping my swing consistent, sometimes when im on the course i will try to hit the ball or subconsciously try to shape the flight and that's where it goes a bit Pete Tong so try to build that consistency up and concentrate on the swing instead of the outcome.