As a Water Ski Coach, I look for other coaches and experts who seem to be helping skiers excel.  Seth Stisher is one of those coaches that seem to always have rave reviews from those who have been under his instruction.   I have not yet had that opportunity to ski with him, but hope to soon.    
 
Seth has posted some videos of some slalom drills that he finds most helpful for skiers wanting to master the "west coast style" and techniques that have proven to be a key for many world-class slalom skiers.
 
The Pullout Drill - notice the upper body rotation, separation of lower body (hips and below lean more than upper body), more back arm effort (pressure), and elbows in...
http://www.youtube.com/v/SLfNGee5LKo
 
The Rhythm or "Whips" Drill - narrow wake crossings - notice the tight line, how the turn just becomes a lean and wake crossing, notice how the upper body leans in the direction of the wake but the ski advances out in front of the body as the skier crosses the center line of the boat, and notice the patience in waiting for the ski to turn - let it dictate the turn.
http://www.youtube.com/v/_f5KQdpqroE
 
Both of these drills look awesome and Seth does a great job demonstrating them.   Consider spending some quality time on these exercises before you chase those buoys.
 
Coach Leach
Frame Switch Ski School
http://www.frameswitch.info