Have found that my pro coil doesn't quite pick up some smaller gold items/earings and faintly hits the thinner gold rings, with no disc. I'm kinda into beach hunting mode now, and have had a 6x8sef on backorder for awhile now. Wondering if the 6x8sef allows the etrac to see these smaller/thinner pieces of gold/jewelry any better? How bout the 10x12, does it do any "better" on the smaller stuff compared to the 11" pro coil?