Ok I find that when using Elfin in ANY attribute, it's good to have a high (maybe in the 600-700 mark), medium (maybe 400-500), and low (can go as low as the 300s) setting. For example, the Elfin I have has 660 (high), 570 (medium even though it's a lil higher than it should be), and 340 (low) g-power dial on it. It also helped to have the ability card Random Power (that's a red-framed ability for those that don't know) whenever using Elfin in your team so you can switch from a higher setting to lower setting on gate cards like Tricky Gate, Duck and Win, and Low Bridge.