I always include "Blue Eyes Chaos Max Dragon" x2
If you wanted to include it, I'd take out 2x Dragon Spirit.
Then take out 3 Spell Cards (Silver's Cry, Dark Hole, Twin Twister)
and add 2x chaos form and 1x Advanced ritual Art.
OR
If you don't want to run Chaos Max Dragon, I'd take out 2 Dragon Spirit
and add 2x The Winged Dragon Ra - Sphere Mode.
Extra Deck looks great, I personally wouldn't change it.
Just my thoughts !