Peace Light,
There is no contradiction in the Quran. It is impossible!!
When speaking on wine, you have to understand the wine of this world is anything similiar to the wine of paradise. You can't even compare them. We have not tasted it, smelled it or even seen it!
In saying that...When the Quran speaks ill of wine, it is referring to the wine of this world. When wine is mentioned in the desription of paradise, this is not the wine of this world! The pure wine as stated by the Prophet, is the wine of paradise, and thus does not intoxicate!
Really I don't know how much more I can say to explain it to you!
Peace and Blessings be to the Believers