For the WODs, sometimes the power versions are the way to go. The power versions of the lifts are perfectly good variations, there's nothing wrong with them except ONE THING: they hinder learning of the squat versions. People end up exactly where you are - unable to throw themselves under the bar to catch the lift in the full squat. That severely limits their potential for lifting the really heavy weights. Thus the power snatch and power clean need to be used judiciously. In general, the power versions of the Olympic lifts are not appropriate for anyone who hasn't developed proficiency with the squat versions.