I'm currently working on a deckbuilding theory for Gravity unupped. I think this may be a good addition to the list...
Now, the main problems I see here are:
1- Oty's. At 3 hp, you'll have a hard time eating anything, but some wise use of Acceleration can help.
2- Quanta. Gravity needs more quanta than other elements, due to its heavy cards. I say adding some Gravity Pillars.
Only tips I'll tell you are:
Don't mindlessly hear those ones that say "slim it down to 30 cards" (even though it's mostly true). I believe that's not always better for Gravity.
Swap half of the Pillars for Pendulums (this is merely an anti-Earthquaque measure).
Test it, and don't be dissappointed if you lose against the AI. Gravity isn't intended to be good against the AI, unfortunately, and Mono-Gravity unupped already has its problems regarding deckbuilding.