I shoot bursts in high speed mode and do get a lot of images that get dumped; it is tough in a sport like hockey never knowing for sure which way the play will go. It does help to have a general flow of the game however.
As has been suggested here in other post I shoot in manual mode. I get to the game early for warm-ups and experiment until I get a setting that looks good. I have seen a suggestion to set exposure compensation but have never tried that. The only time I get the three frame burst is if I set an exposure bracket (which is different than the exposure compensation) where you shoot an over and under exposed image which is good for landscape but bad in sports.