I didn't realize the ace 350 was so much more complicated than the 150.
Trust me, I know more about how to use your detector than you will for a very long time. The fact Minelab changed the controls around a bit and gave it a faster processor really doesn't mean much at the end of the day, except for their bottom line and you paying more money.
And as I said in another post the problem with the E-trac that this thread is about could very well be an equipment issue and I believe I am the only one to suggest how to fix that, and not just talked crazy settings. The guy has detected a long time so it doesn't make sense he's got a proper working detector and he's screwing up so bad the experience is terrible. If I had money to burn I'd place a pretty good bet it's the Sunray probe switch that is to blame. Could also be a bad coil too, but first things first which is to get rid of the probe. Problems with these things can be a little tricky sometimes to diagnose which is why I owned two Explorers for quite a few years. It gave me a back up and made figuring out any possible issues fairly easy by trial and error.