I did a paver side walk that is heaving excessively on both sides only, no where in the middle. So its shaped like a gutter, not that dramatic but its beveled. I did the edging on top of the last compacted lift and under the setting bed so I think the install part was right. But I used Home Depot edging which I've since seen others criticize, and I used the Home Depot plastic spikes every 3rd space. Can anyone offer some info or suggestions?