Skateteacher,
I use my 5.3 about 90% of the time. I like it in trashy areas like parks. I use the 10 DD on open fields or old city lots and/or just to go a tad deeper.
This are my settings for a moderate to high mineralization here in New Mexico. Start with the RX at 4, then increase a little at a time until the detector becomes chattery (unstable). Reduce RX until it smooths out. I've never taken AM past 8 in my area.
AM = 70 to 75, DISC = 85 to 88. You can TX Boost too. Just experiment with these settings in your area.
Good Luck and have fun with the 5.3 Eclipse.
TC-NM