Phil in the video you do a noise cancel (which is for EMI not ground noise) but at no stage does it show you doing any sort of ground balancing.
Yes the 6000 picks up hotrocks but so has every other detector I've owned including SDC, GPX4500/5000, GPZ.
In the video it appears to show the machine running badly out of balance & reacting over all of the ground, not just hotrocks. That will just make the hotrocks even worse.
Do you run through a ground balance process prior to starting detecting?
View attachment 11409
View attachment 11410
View attachment 11411