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Problems Rendering Hair Cards in Sub. Painter?

Hello! I'm really new to using alpha cards in general, but namely hair cards. I have all of my textures made, and everything will look alright in the preview/painting window. A few strange things with the height, but I figure that's just because it's not a fully rendered, fleshed out shot of the model.

However, whenever I put my model into the Iray rendering mode all of the hair cards have 1. none of the poly's softened, 2. hard shadows on the sides and don't blend together nicely and 3. no height information whatsoever.

I've been searching everywhere for fixes but it seems that for the most part there is no information to be found. I'm wondering if this is just an issue with Iray not being able to render alpha cards correctly or if I am making a mistake somewhere along the process. I would try to render it elsewhere but the only programs I have that I can get really nice renders out of are Maya and Iray. 
Any help would be a million times appreciated!
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