Does anybody know if those Detech or NEL coils made for a Tesoro Lobo ST will actually get better depth than the Tesoro coils before I go and buy one and can't return it? Any recommendations on the best coil of these 2 brands for deep silver hunting? I have all of the Tesoro coils made for my LST, but I could never get more than 8 inches on a silver quarter even after having the detector tuned to the 9 x 8 coil in Disc mode at the factory. My buddys with Minelabs can get several more inches or