Hi Greg , I read all your posts at all forums. (You get around haha)
I had this exact same doubt not long after getting my DFX. Thinking I was not
getting deep enough , afraid I was missing goodies. Well, I was, but not because
the DFX didnt see them, but that I didnt know what I was listening and looking for.
Try this once or twice and see if it doesnt help change your mind. It really did for me.
Sweep Speed 1 ( and go nice , slow and deliberate)
Recovery 10-15
Hot Rock Reject 20
BottleCap reject 1
Accept ALL from like neg.70 to +93
And get the PreAmp to 4 if possible
AC 75-80 DC 40-50 ( back down AC if erratic behavior no lower than 70)
Ground Balance thoroughly, twice to be sure.. over clean ground.
ToneID ON Filters 4 (play with these, important part of deep hunting)
The rest to preference mostly. Using this setup, search an area like you
"know" there is 10 inch deep coins. When you hear a high tone, investigate it.
Pinpoint that sucker in DC mode, and see if its coin sized and how deep.
I find quite a few deep wheats and silvers that sound like crap... but I didnt know
before, that they would sound like crap ! With those settings , when you hear
a high tone, even mixed in occasionally with other tones and nulls - check it out
if its 5+ inches. Just the other day, I had the worst sounding hunk of crap signal
ever, only 5 inches. Didnt barely register on the Signagraph, crackled and nulled
50% the passes... but every other pass, I got that sweet chirp. Dug it up and there
she was, a nice Merc... only 5 inches deep. Yet the next signal I got was 7 inches,
and blaring an 80 on the meter , plain as day easy signal, and it was a Wheat penny.
I determined the dry ground, powerlines above me, and some iron/trash debri in the
area was skewing my signal, and almost fooled me on that dime.
Trust me, I know the Explorer guys get deep coins ! But just ask them, if that 10" deep
mercury dime, came in loud and clear LOL... it most likely was not even close to a
great signal, but they knew what to listen for anyway.
Also, yes people find stuff 12" down. I gotta laugh even thinking about it though. I have
rarely, barely ever, detected a spot where after 7-8 inches, the ground stayed even diggable.
I detect 100 year old homes all the time, and 8 inches down, hit original base clay dirt from
when the dang house was built ! Maybe farmer fields and battle grounds etc I could find
deeper stuff, but 100 years or so old coins in my neck of the woods, are all 4-6 inches. Eight
inches is friggen deep !!
Sorry about this long book I wrote LOL. Just hate to see you switch , and then find the same
exact scenario. My problem, same as yours I believe, was that I was so used to finding clad
so easily, and it sounds so good ALL the time, that I thought a 7 inch silver dime would sound
as good,and sweet. It absolutely "wont". But once you know what it really does sound like
when deep, its just as sweet predicting a good find, with non-traditional sounds and readings.
For example... have you ever swung 20 times over one target, and got Null null null..chirp, null
null, null, null chirp. No Signagraph reading barely at all, with an intermittent random number ID ?
I do all the time. I pinpoint, see coin size, and 5+ inch, and dig. Occasionally its an old
nail or random thing, but alot of times, its the real deal... keeper

Thats just how it is I figure !
In any case, I detected it, dug it, and found it, with the DFX. It didnt jump out and say "1902 Barber
here", but did enough to let me get it.
Dont give up yet

At least try one, or compare. If I do and find better results , then I will probably
change brands too, but I see no reason to currently. The Explorers just have a neat way of
picking out keepers that are masked by iron or trash easier. I think thats why they find alot
in hunted areas... not so much the depth involved, but nabbing the ID from a masked target. All
those are still sitting around all over the world, because other machines didnt distinguish the good
target sitting by a chunk of iron. BTW, the DFX can be setup to seperate targets very well in trashy areas. I sacrifice depth hunting all the time, and pick out good stuff sitting in 20 million pull tabs.
Good luck in whatever you do, and keep us posted. Let us know if you try the above settings and how
you liked it. Cya !