That is actually pretty smooth looking, like really smooth looking, the total opposite of what your looking for.
What sort of ground are you running that over at 100 Mhz at nearly 13 meters? Looks like you where running on a beach.
also, I have only owned 2 my self and have only operated 5 different models, but the 2 I owned (still have one) the vendors who sold them to me provided a good long course on the units, the one I currently use provided a 2 week course. There is always training, I would say contact your vendor.
After we pay his service he only told us that there is ground disturbance and posible bigger target. Then he leave us without answering our questions to the image of the detection he gave to us. Thata why where confused sir/mam.