Well you can play however many cards you want to play. A 30 card deck will on average be more consistent, and faster than a 60 card deck, but that doesn't mean you can't use a 60 card deck.
I am afraid mono life doesn't fair to well against FGs. However they are good for farming ai3, and Top50.
It is almost like you have two decks and you decided to smash them together. If you do want to continue to use a 60 card deck I would either cut it down to a duo element deck, or make it a full on rainbow and balance the quantum use of each element, and run only quantum pillars.
If the reason you like 60 card decks is because you want to play as many of those really good cards as you can consider this. Take Emerald Dragon for example. In a 30 card deck if you are running 6 you have a 1 in 5 chance of drawing one each time you draw. In a 60 card deck you only have a 1 in 10 chance of drawing a dragon. So really the only reason to play more than 30 cards is to prevent running out of cards and losing. So a rush deck that will either win, or lose early really has no reason to run more than 30 cards.