I have a fascination with NT decks.
I took your deck, and I came up with this:
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55p 55p 576 576 576 576 576 576 576 576 576 58v 58v 5aa 5aa 5aa 5aa 5aa 5aa 5aa 5aa 5i4 5i4 5ig 5ig 5ig 5ig 5ig 5jm 5jm 8pp
First off, pendulum builds tend to guarantee a third-turn nymph. Regardless of whether you have water nymphs or not, I'd use NT. This is because it allows you to choose what your first nymph is - if you need an earth nymph before a water one, you can get one then, and not wait until turn 5 at best to petrify something.
After that, I put in pulverizers and gravity shields as a method of defence - Andre's semi-instakill is a nice technique, and it reduces strain on earth quanta if needed.
The gravity pull combo is an interesting one, but in the end I felt it took too much strain with an all pendulum build, so I went for shields and pulvies - and that's still rather strained. It's the downside to an all pend build, but it grants a ton of stability to a deck.