6000 vs 7000 people are really missing the point here on the settings they are using. If you run a 6000 in difficult, wiggly lines, however you want to call it. You can miss gold at a certain size and depth. That same nugget two inches deeper and the 6000 will get it. The 7000 in difficult has less of a problem with this phenomenon, although it is still present. I have good evidence to back this up. Look at the last minute or so from this video and it will prove it.
this video is testing the algoforce but just by chance I witnessed this exact situation when running the 6000 over the test nuggets.