I never bursted with three fires for my earth but if you use the original Earth gs burst strategy backwards, you can get better exp and less sp drainage. So first is terra, then tree bind, then shield def on cow and then blockage, blockage. I used this since my friend suggested it to me and I got over 100k exp on 2x. Now if you replace the water with a fire.. you can get much more. But it would help a lot if you used RB fires because I did.