I have both the Camo F75 and the DST F75. Never want to use the Camo version anymore except for the all metal mode. DST is much more stable and I don't notice any change in depth while in disc mode. Maybe because I can crank it up. The non DST F75 wouldn't have been able to hunt where I found the relics in this post without giving me a headache even at lower sensitivity.
My first real metal detector was the Teknetics Omega 8000. It's a great machine, but it struggles with EMI mightily. I just thought it was normal so that when I switched to the F75 I was kind of used to some kind of chatter. I think that's why I didn't wrap mine around a tree