It seems to be a quite good Z combat behaviour. I'm mad waiting to test this! Keep on this amazing work!!!
(PZ won't become easier... as the life would' t become easier be in a zombie apocalypse! ).
Just, please, don't make combat depend to much on aiming in close combat as the controls and the external view don't make aiming easy for the player...
Avoiding the Z you didn't see is already an obsession!