As was mentioned, the Tracking mode is fine in relatively clean sites or sites that do not have ground conditions that change continuously like the wet sand regions on a salt water beach.
If you are hunting a site that is littered with targets - ferrous and / or non-ferrous - do not use the Tracking mode for GB'ing. The detector will be trying to track to both the ground as well as the targets and the end result is that you will find both your target ID accuracy and overall depth reduced. Since you have continuous ground mineralization displayed both in the numbers on the right side of the screen and the vertical bar on the right edge, you can see if an adjustment is needed . . . . a few numbers off will not hurt performance especially when compared to what is happening under the hood when you are in the Tracking mode. There is a reason that Tracking is not an option when the SALT BEACH option is selected.
When you say you are getting "pesky 90+ signals", are you talking about an occasional one-way response or are you digging targets and finding them to be trash? You can reject the 96+ range to eliminate some of the large iron that can hit in that region and if ground conditions are playing a role, try the GROUND NOTCH function to quiet things down.
Let us know if this information answered your question . . . . .
Hope this helps
Andy