I have a deck similar to this and here are some suggestions for the deck.
I would recommend adding in overload fusion. It opens for more ways to win. Combos well with future fusion to.
I would also include torrential tribute and mirror force if you have them. Opens up the field for you so you can go for the OTK or large amounts of damage. Also just another form of protection.
I also recommend adding Gorz to the deck. He is practically a staple in this format. I would use him over peacekeeper. Gorz will save you in a pinch. Would you rather topdeck a peacekeeper or Gorz?
You might want to add 1-2 Gold Sarcophagus to allow you to search for your otk cards early on. (Future Fusion, Overload Fusion, Limiter Removal.) Or it can help you search for heavy storm or whatever else you need. You could try -1 smashing ground and adding a Gold Sarc. You don't need three smashing just because your guys are big beaters as is.
I would consider running 1-2 trap stun in the deck. The reason for having trap stun is because it is a little more versatile than some of your other protection cards. This card is great at protecting you for setting up your OTK. I would think about taking out -1 My body as shield and maybe -1 BOM or -1 Smashing.
I would recommend taking out Dark Armed just because he is probably not going to be very consistent in this deck. This deck does not have a lot of ways to manipulate the grave. If it is working out for you consistently then go ahead and keep it.
These are just some ideas. I hope they are somewhat helpful.