That is a definite improvement. In fact you won’t get it any better than that with a single texture on a totally flat baseboard. However, totally flat does not make for a good look.
Make the terrain just very slightly uneven. This will create slight shading either side of the gentle slopes and will distort the textures into slightly different patterns. In turn, this further enhances the look of your single texture by altering parts of any remaining checkerboard effect.
Use low sensitivity when you do this, but vary the radius for different bits of the board. Don’t make the ground too high or low; I’d say keep it to just one to five metres higher/lower for “flat” ground, but make sure there is a good uneven spread of slopes and depressions.
Stop and look at the result at ground level, as you have with your last shot, to see how it’s looking.
As has been said earlier, lower views will look better than high ones.
Keep it to the single texture only for now. More can be added later, but by keeping it to one you will better see the effect of how the technique works.