Entity velocity spawned when right clicking item

I just wanted to ask how I would change the motion vector of an entity i spawn when i right click an item. The entity has no gravity and it completely ignored the motion vector from the "spawn at" block. I also want to then run more procedures applying to the entity that was shot. 
 

In short I want to make an iceologer staff that shoots ice blocks that fall after some time but i cant get the ice block to move and I have a procedure that makes it fall but spawning it from the right doesnt seem to activate it or recognize what entity it is supposed to be targetting.