Well, i know that you are trying to keep the Theme of Chaos/Twilight, but if you are going to run Starlight Road, you may as well run Stardust Dragon, because it is a good source of quick power, and it happens when you negate something huge, such as Heavy Storm or Dark Hole. You run alot of level 4 creatures, so I think an Extra deck could consist of some of these:
Light Creatures:Number 10: Illuminight
Number 39: Utopia
Number 16: Shock Ruler, Controller of Colours
Dark Creatures:
Steelswarm Roach
Verz Nightmare
Verz Thanatos
I hope that my tips for the Extra deck have helped