Become an official yourself!
In 5th grade, the players, coaches, and officials should be out there to have fun. Winning should be secondary.
Ask other coaches in your league if they feel the same way you do. Do NOT ask parents of players--they will be completely biased. If other coaches feel the same way, call the assignor of officials, or league coordinator, or whomever. If it is a league-wide problem and players are actually getting hurt, the assignor or scheduler would probably tell his officials to call a few more fouls...