Yes the control points are not well distributed. You will get "perfect" result around control points but the model may not be accurate as CC squeezes it between these control point. I would recommend to mark these control points as only check-points and add additional control points. Also all control points should be measured in known coordinates and vertical coordinate system. In other words you will get best results if all control points are done in one measurement and not from different sources. For example GNSS survey or from reference network.
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