I feel experimntation is the name of the game...I feel those experienced that can get a stable unit with a manual setting in the 20's should get good depth for the area or perhaps a semi-auto setting would work better especially for newbies to the Explorer in decent ground..Indeed sem-auto setting may overcompensate in extremely bad ground but in yours it may not. Heck I hunted in quickstart with -16 sem-auto setting being the setting and got 8 inch silver coins. I guess what I am saying is do experiment and see what works for you. Nothing set in stone only reports from all over the states with success in a variety of settings.In addendum just because Joe Blow uses a particuliar setting with success don't mean it will work for you..We can debate manual or sem-auto but nothing like a little on the site settings to see what works best for us.