Evo mortar and evo bats need their nerf reversed. They are not great and of the worst evolutions now, and were not overpowered to begin with.
Other option is to buff the normal mortar and bats (not their evolutions).
Void need its first single target hit not to kill troops like magic archer immediately, so that 4 elixer magic archer can get some value (about 2 shots) before it dies.