I barely even burst for 1m with Phantom Grids and on-element. That's not how it works.
Remember kids, Phantom weapons are NOT the Grid. Phantom weapons are merely a small topping on the cake - if you can make PROPER Grid out of Lances/Hammers/Glaives/Bows, then the topping is fine. But they are NOT a be-all, end-all thing like I constantly see people say. They're a MINOR damage boost, IF you can make it work... and you probably can't.