Where do it say a healthy itachi can only do 3 Tsukiyomi's????regular genjustu can easily be broken by a rinnegan user and he has 3 tysukamis before his chakra runs out and thats a healthy itachi so go on just spam it on 3 paths he will run out of chakra his best bet is to stay back with the totsuka with his susanno but then deva can fly in the air and do ultimate shinra tensei or chibaku tensei while the others summon animals and get his preta path to absorb susanoo
A sick one did Amaterasu and 2 Tsukiyomi's when he was in konoha