Terrain UV coordinate help

I have set up this alphamap terrain that does multiple textures which works correctly except the textures seem off. The more you zoom out the more it the textures seem repeated. I believe this is because of the uv coordinates, looking for help on how to fix it as I am lost. Image of the problem: http://s13.postimg.org/dgh4awilj/image.png

    float incrementSize, tu2Left, tu2Right, tv2Top, tv2Bottom;
    int k = 0;
    float texUIndex = 0;
    float texVIndex = 0;
    incrementSize = 1.0f / 255.0f;
    tu2Left = 0.0f;
    tu2Right = incrementSize;
    tv2Bottom = 1.0f;
    tv2Top = 1.0f - incrementSize;

    for(DWORD i = 0; i < rows-1; i++)
    {
        for(DWORD j = 0; j < cols-1; j++)
        {
            indices[k]   = i*cols+j;
            vertices[i*cols+j].texCoord = D3DXVECTOR2(texUIndex , texVIndex + 1.0f);
            vertices[i*cols+j].texCoord2 = D3DXVECTOR2(tu2Left, tv2Bottom);

            indices[k+1] = i*cols+j+1;
            vertices[i*cols+j+1].texCoord = D3DXVECTOR2(texUIndex + 1.0f, texVIndex + 1.0f); 
            vertices[i*cols+j+1].texCoord2 = D3DXVECTOR2(tu2Right, tv2Bottom);

            indices[k+2] = (i+1)*cols+j;
            vertices[(i+1)*cols+j].texCoord = D3DXVECTOR2(texUIndex + 0.0f, texVIndex + 0.0f);
            vertices[(i+1)*cols+j].texCoord2 = D3DXVECTOR2( tu2Left, tv2Top);

            indices[k+3] = (i+1)*cols+j;
            vertices[(i+1)*cols+j].texCoord = D3DXVECTOR2(texUIndex + 0.0f, texVIndex + 0.0f);
            vertices[(i+1)*cols+j].texCoord2 = D3DXVECTOR2(tu2Left, tv2Top);

            indices[k+4] = i*cols+j+1;
            vertices[i*cols+j+1].texCoord = D3DXVECTOR2(texUIndex + 1.0f, texVIndex + 1.0f); 
            vertices[i*cols+j+1].texCoord2 = D3DXVECTOR2(tu2Right, tv2Bottom);

            indices[k+5] = (i+1)*cols+j+1;
            vertices[(i+1)*cols+j+1].texCoord = D3DXVECTOR2(texUIndex + 1.0f, texVIndex + 0.0f); 
            vertices[(i+1)*cols+j+1].texCoord2 = D3DXVECTOR2(tu2Right,tv2Top);

            k += 6; // next quad
            texUIndex++;
            tu2Left += incrementSize;
            tu2Right += incrementSize;
        }
        texUIndex = 0;
        texVIndex++;
        tu2Left = 0.0f;
        tu2Right = incrementSize;
        // Increment the tv texture coords for the alpha map.
        tv2Top -= incrementSize;
        tv2Bottom -= incrementSize;
    }