two things
1. Good comments from chicago, boogie and beaker.
2. if you want better, more consistent reffing, writing "new and improved" rules won't do it. Regardless of how fantastically well written the rulebook is, it has to be enforced by flesh and blood referees. Those referees have their own minds and will see situations differently. The best way to improve the quality and consistency of reffing is to improve the refs themselves, which means an ongoing training and proficiency system. Train, evaluate, coach - that's what you need.
To elaborate on one of Chicago's comments - the NXL refs are the best for two reasons: they work together all the time and they have people watching over them. By working together over a long period of time, the calls they make will be more consistent from ref to ref and from game to game.
PS - Personally I prefer the impact interpretation of the rule. Did the player (regardless of where they were hit) have an impact on the game? Impact doesn't just mean shooting their marker, it means continuing to act as a live player by talking, loading or just sitting in their bunker. If the player is not actively checking or trying to check themself and a ref has to run over to get them, they've had an impact on the game by distracting the other team and a 1-4-1 is warranted.