I had originally used paintFX for the geo, as it was quick, but I found it to give me less control over the shape of the grass. So I modeled a few separate blades and instanced them around. The dynamic control that paintFX gives you would be exactly what I need, but I don't think I can add those nodes to my geo.

I'm looking into a few different things, such as a hair system, nCloth and an IK Spline rig. The spline rig looks to be the best option, but attaching it to the thousand of instances I have will probably be a pain.