I am currently running:

10k in the center 7k up front and 2k rear, any advise on this setup, I have quite some ballooning on the front wheels as well.
Is a diff oil lighter then 1K recommended? or is 2K the thinnest one should go?

I currently have:
Mugen Seiki 2K, 5K, 7K, 10K and 30K that should be enough choice right?