The best thing I did was change from conductive to ferrous.
IMHO, if you hunt park turf mostly, going into the FERROUS setting is one of the "worst" things you can do. Stay in CONDUCT, with a minimal iron mask when park turf hunting. You will find much more deep coinage. Some of my buddies used to hunt in FERROUS at parks, but when they saw me pulling lots of oldies out of the turf, they made the change, and are very glad they did. Their change to this setting wasn't easy for them though. It took a while to learn how the tones changed for the different items in the turf. It's hard to change to CONDUCT on the machine if you've been using FERR for a while....it takes time to relearn. I have many reasons why CONDUCT is better for parks. FERROUS will give you mixed lows and high tones on deep silver targets, confusing you even more. Thats because the target ID of a deep silver will tend to bounce across the top of the screen, from left to right. Leftmost targets in FERR will sound low, while rightmost targets will sound high. In CONDUCT, every signal whose ID is at the top of the screen(no matter if it's far left or right) will give off a nice high tone. So even when a deep silver coin bounces across the top of the screen, you will always hear a nice fluty high tone...love that sound!!
You have to also consider what types of signals you encounter more of in parks. By far there is a majority of aluminum foil, pull tabs, ring tabs, beaver tails, screw caps. In CONDUCT, you're able to "pick" out the higher tones of coinage better than you can while in FERR. That's because most of the trash targets are down at the bottom of the target ID screen, while the old coinage is near the top. In CONDUCT, there's a better separation of tones between the trash and the old coinage. This is desirable....you want to hear the widest range of tone from deep coinage(mid-high tones) amongst a sea of low tone targets(trash, foil, tabs, etc). In FERR, the difference is much narrower...some trash items actually will sound high while in FERR. Not the case when in CONDUCT. I believe hunting in FERR will cause you to have to look more at the screen to see where the target hits, while in CONDUCT, you can hunt more by sound, with very little time spent trying to find out where the target hits on the screen or what numbers (FERR/COND) you have. The Explorer is a "Tone" detector. Learn the tones it makes, and be a master hunter with it!!
Now, if you're not hunting the turf with you're Explorer (demos, old homesteads, areas ladened with iron), then FERROUS will be beneficial because the majority of trash in the ground will be iron (signals that hit far left on the display).
I think this is the one setting which has helped me the most to find lots of old, deep coinage in the turf.
Secondary is not trying to hunt in max sensitivity. Dropping down to 21-23 (manual, never Auto) on the SE will still give you great depth, with minimal overloading of your signal.
HH,
CAPTN SE
Dan