Heel shots are caused because you either move the center of your plane out towards the ball during your swing or you start too close to the ball at address
Most players who suffer from weak high shots are set up with the shaft straight up and down instead of with the shaft leaning forward
If you tend to come up out of your stance and hit thin shots you can not only fix that but also increase your clubhead speed with this easy drill using a block of wood to place your toes on