Alright, let's get started xD:
First of all, maxing 3 Gogogo Ghosts is mandatory as it is a DARK Zombie. Gogogo Ghost has amazing synergy in the Deck from Zombie support and dead draws less than Gogogo Giant.
Second, Caius is pretty random in here as you will rarely Tribute Summon, as this Deck is dedicated to Rank 4 Xyz Monsters.
Third, Spirit Reaper should be sided. It is not a card you usually main in the Deck, even if you use Creature Swap.
Fourth, Creature swap should be taken out. you rarely will have to use it and it is better to use your resources Xyz Summoning.
Fifth, Trap Cards are largely unneeded in this Deck. This Deck is basically a turbo/aggro deck, and you don't want to spend your time making backrow when you can go spam Xyz Monsters.
Sixth, get rid of the ZW. Dengakuman explained that, so I don't really have to say anything. Having a hard to summon Level 5 that eats up your Normal Summon is just unneeded.