Yea you can go with 2 leviar.Macro wont cause you the duel, you dont rely on grave at all.Having macro will shut down darkworlds, inzektors etc.
Btw Rai Oh effect cant be used when opponents use Monster Reborn, Call of haunted etc.It can only be used on inherent summon(summon that doesnt start a chain like synchro summon). So I think its better to replace it for cards like debunk or prohibition.Debunk counters some decks very well and prohibition can be used against most deck that rely on one card.Like darkworld that relies on grapha or Inzektors that rely on hornet