All the advice sounds like it's adding up to solid ballstriking.

I'm a big fan of a simple tee drill.

Put a tee in the ground, level with the top of the grass, 3" in front of the ball. Do whatever you have to do to hit the ball AND dig the tee out of the ground.

For me, right now, I have to focus on hitting the inside quarter of the ball and digging out the imaginary tee. This produces solid ball strikes for me.