What to exchange in my deck?or not.?

Well if I were you I would've loved that deck. What you might want to boost your deck is Buster Blader, Dark magician, Polmerization, and Dark Paladin. Fuze Buster Blader with Dark magician to make Dark Paladin. All dragons on the field AND in the graveyards will boost his attack by 500 for EACH dragon : ) I don't know about many of those that you have so you might want to choose. Sorry I couldn't help more but Good Luck : )