According to Andy Sabisch in his book mastering the explorer he says,
quote, the most important difference between detectors with conventional ground balance circuity and the minelab explorer with fbs is the explorers ability to hunt even the most highly mineralized areas at maximum performance without the need to make adjustment's before starting to search.As soon as the explorer is turned on and swept across the ground the ground mineralization is quantified and then simply ignored. Any signal from a target is then easily recognized and analyzed for accurate identification. This ensures that the explorer can locate targets deeper than other units that require compensation for the mineralization. this often adversely affects detection depth and target identification accuracy. This is especially true in areas where mineralization is either extremely high or often changes within a short distance. end quote.
Then he goes on to say it preforms better than detectors with conventional manual or even automatic ground balance circuits the more severe the ground mineralization becomes. it will mirror the results of air tests in the ground.
It seems to work for me, I don't see how you can be losing depth in trashy sites. The explorer does not see targets as ground minerals.