Falling Block hitting Player and Damaging them?

I am trying to basically use a Falling Block as a projectile. A player would shoot a falling block and if it hits a living entity it would be damaged. Here is how I currently have it and it is very buggy and inefficient:http://pastebin.com/rmz4qfJA
*This is using the Heroes plugin so ignore all the Heros jargon just look in public SkillResult use and Damager
I am looking for a better method or an improvement of what I currently have.