i would have a guess that ure hanging back on the right foot at impact and catching it too much on the upswing causing the height and lack of distance, if this is the case i would suggest maiking sure u finish with ure weight on the left foot at the finish and up onto ure right toe also,another tip i would say is instead of feeling like ure hitting the driver up in the air try and feel like ure hitting it out ,like sideways from u with all ure force going out and away from rather than anderneath and up,hit out not up,hope this helps