Coinboy, did you find that coin? Its really nice. I dug one this past summer but mine was cut perfectly in half. 1731
Recovery speed of 5 is a good place to start then go down for more depth or up for better separation.
I just posted this about the equinox today.
Here's what I have found by testing several times.
1.In my opinion park 2 is a deeper mode.
2. Park 1 will give a more reliable VDI on deeper coins. ( coins 10 inches or so )
3. On the deeper coins Park 2 will report a lower VDI. But will give a stronger tone response.
So for me I use Park 1 most of the time.
On the rare occasion when I get to go on a civil war site in the woods I will switch to Park 2 to get a stronger tone on the deeper targets.
In Park 1 I can ignore some of the lower VDIs ( 1 to 8 ) when field hunting old house sites thats my be littered with can slaw from farm workers. (You will still dig plenty of can slaw at higher VDIs) If I was in Park 2 I couldn't ignore these numbers because I know that a deeper coins will bounce down into that range.