Ok we've established that. Now do you believe your deck may run faster (and more consistently) if you focused either solely on
Delirium or Landfall? The only reason that I ask is that on Zendikar, small creatures relied heavily on land drops just to keep their strength up. However on Innistrad creatures can willingly go to the graveyard and it will still benefit you. Also you do have a LOT of high drops in this deck. Though your idea is well thought out it would hurt you in the long run. Reason being, if you want a strong and consistent deck you'll want to make every card (not just the high drops) have an impact on the game.
Here's an example; [U/B Zombie deck]
rottenheart ghoul is a decent card that makes any player discard when it dies. Since madness is popular again you probably won't be using that effect much on your opponent. However you can use that effect on yourself for your own graveyard triggers. You can use the zombie as a blocker and then sac it by playing
merciless resolve and you kill your creature, draw two cards and if you have any madness cards in your own hand (such as
gisa's bidding) you would have gained card advantage over your opponent AND replaced your 1 zombie with 2.
Even if you are playing within certain colors you need to ensure that EVERY card in the deck contributes towards the focus of the deck. Similar thing with your spells, there's no issue in mixing blocks but if both of the card sets have cards that don't have synergy between them then it like you're only playing HALF of a fully functioning deck. Look at it this way;
1) Find out what you want your deck to do the most
2) Find an overarching theme or mechanic that the deck will run by (I would recommend
delirium and madness over the landfall personally)
3) Side board any cards that do not fit that mold (This would be most of the high drop Zendikar cards)
This way your deck will have focus and you'll be able to tweak it little by little. How does this sound so far?