Dying mob animation prevents killing other mobs in farm / stack

When farming large amounts of mobs with spawners, especially when they die on their own (automatic killer or cramming) the mobs that are in the process of dying still have a hitbox and will prevent the player from doing damage to ANY mob in the kill chamber until the animation is over. This is fairly minor and limits the rates of farms to a "reasonable" level until you are dealing with situations in which several stacks of 150+ mobs all constantly dying, totally preventing the player from interacting with anything in the kill chamber at all. This then compounds with some mobs not giving any / full drops if not killed by the player, effectively shutting off the farm until the mob count lowers enough for the player to get hits in.