Forget what it reads as, turn down the discrimination so you still get a beep on a pull tab. If you can't hear a pull tab, you won't hear 90% of the gold rings.
Just keep your coil LEVEL with the ground during the whole sweep. DON'T SWING IT, SWEEP IT. Also you have to over lap at least by half. The detector won't find any rings if you don't put the coil over any. Keep at it and they will come. Also, don't run the sensitivity so high. Many think they get more depth this way when in some areas they end up getting less since the detector has to sort through more minerals and could miss a target hidden in the signals.
Good Luck,
Sandman