u should max out shura and add 2 zephyr and take out mistral......add 1 sirroco and take out jetstream and take out abrolhos for another zephyros and add another vayu

Matt here is a blackwing deck i have created. It should be better then the one you are currently using.

Blackwing deck: (Put it in your deck folder)

http://www.sendspace.com/file/t74psm

Well, I don't know much about Blackwings, but there are cards there that are too costy, and the effect doens't really worth agains't some opponents, like Lightning Vortex, because it is only worth if your opponent is overextending.

Also Agains't the wind seems tricky, since is not something that you will be aways able to use due to it's cost and the condition (Having a Blackwind that you want in the graveyard), however it can be good due to DAD, since it gives you control of how many dark monsters you have on the graveyard, however I guess it is a choice.

Blacklash by the other side seems like a Mirror Force but... that destroy defense mode monsters? Well however again it needs 5 blackwing monsters in your graveyard... again another card with a condition, mainly when you have so many cards that remove monsters from graveyard to activate their effect.

There is only 1 card there that can get ride of a monster without "Destroying" it, since some monster cannot be destroyed you may need card to get around they, like Red Nova Dragon, Tiras, etc, you can compulse they, you can banish they, but you can't destroy.

Anyway, everything was pretty much opinion and ideas, I mean, you can run it on the way you preffer, but sometimes there are some things that you will need to find a way to get around.