No matter what detector you buy you will have that problem.
Pull tabs, gold, rings, have a very similar signal to each other so all the detector
can do is give its best guess as to what it is.
If you went to a park, soccer field, or ball park, your going to find a lot of trash.
If you put your Ace in coin mode you will do much better.Put it in jewlry mode and you will
continue to get coins but now you will have a chance of finding rings gold/silver but their
conductiity is similar to one another so your llikely to get lots and lots of junk but one
day after digging all that stuff a ring will appear, count on it. Nickels will also come up in the pull
tab range. I have gotten dead on readings on nickels and gotten pieces of soday cans that
got chewed up by the park lawn mower.
-)
I have the same problem with my MXT as well and its a better machine than the Ace but
it can only give you its best guess. Sometimes with the Ace I get a.10 cent reading and when I dig
it it turns out to be a penny.
Where have you been hunting?
For real trashy areas you might want to get the 4.5 sniper coil.
Katz