Looks like it's tiled to many times. I never used easygen or radiant with terrain before, but I would try to reduce tiling in easygen until the result fits your needs (I dont know if easygen has a feature like that). So you have to simply scale your uv's of your terrain faces. Since its tiled to much, you have to scale the faces in the uv down. I hope that makes any sense. Maybe you can scale the uvmapping in the shaders, I dont know if thats possible.