Hi,
I went back and added the force fields on the projectiles and the cell fracture on the wall, enjoy :
I tried something with adding constraint to all the little pieces that makes one brick to get them stick together until the projectile hit them, but right now I just saw that I didn’t save the blend file after the animation, so the constraints are not there anymore 
^This.
It do add a lot of constraints but the final result isn’t too bad, if you look closely you can see some imperfections when the bricks are bouncing before being hit, but, overall, it is quite good
Cheers !