Do you use it for tier 1 or tier 2.?
If I was there, I wouldn't use spun articles for tier - 1. You should be very careful with this.
Hire a quality writer from your side, there are so many folks out here ready to write for you. Go to copywriting section and find a suitable writer. If you think it would cost high for paying the article then you could use tools like WordAi for spinning (Tier-2). All the best..!