Played around a bit and found that the shader only deals with the top verticies. Having multi faced curved meshes did not work well at all.
What did work was tilting the existing meshes outward and adding a third one.
Looked decent in the test game looking down also.
Attached below is the veg folder with the changes. Free to use for what ever purpose.
There are 4 different grass types on the texture, so feel free to map them around.
You will need to set this folder in the test game (tab tab) settings, and then cause the vegetation to regenerate by changing the quality, quantity, height or width.
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz, 2400 Mhz, 4 Core(s), 4 Logical Processor(s), 8gb RAM, Nvidia gtx660, Windows 7 Pro 64bit, Screen resolution 1680 x 1050.