block break event

I want at the very least that blocks broken by pistons specifically shulker boxes always break at the lowest center point to prevent them not being collected in hopers.  

What would be wrong with the items simply falling straight down at its origin center?

When pushed by a piston the blocks should stay in the center and move in the direction it's being pushed. not randomly fly up or sideways or both.

when broken and they pop up and sideways this can and often does lead to loss both the shulker and its contents.  

I have had blocks I broke fly as many as 8 or more blocks away from its point of origin.  WHAT IS THAT?!
I've encased myself in a 3x3 room to mine gravel over and over seeking flint; only to have as much as a third of a stack of gravel glitch through the solid blocks and spread in all directions outside my encasement.  WHAT IS THAT?!