Most importantly the combination of aiming correctly and staying over the ball on my backswing by keeping my head in place produced shots that mostly started on-line. When my rhythm is good, which usually means I could see the shot I am about to play, then the contact was also good and the ball traveled the correct distance.
It is interesting how being open to the target line also makes it seem awkward to swing the club off the ball outside because that would cause the shot to start too far left. So it does the opposite which is encouraging a more inside path by turning my body and this keeps my arms closer to my body. Keeping my arms closer makes it easier to stay within my foundation/stance/feet and improves footwork and balance.....all good things for me.
I think I have been setting up closed for a long time and I was happy to correct this with good results at Pawleys Island.