then either there are no targets left, or what is there is likely masked by shallower trash (rejected targets).
If you're using your Classic ID at maximum Sensitivity and the least Discrimination you can tolerate (9-o'clock setting or less), the you might want to toggle to the All Metal mode and check the area.
If you're getting targets there in All metal that are iron or small, low-conductors such as foil, then a smaller coil would be the way to go, as well as removing some of that masking trash.
If you're certain the site is void of targets you can hit with the 8", and there isn't a trash issue, then forget the 950 coil. There is very little difference in depth between the 6