Generally speaking will I be better off using my stock coil vs the 4x8 SEF when searching ground that is not cluttered with trash? In other words can I expect a bit more depth out of the stock over the 4x8? Just wondering if you've found that you squeak a bit more depth out of the stock? Also, under the same conditions would a 12 x15 coil be even better? I have the 4x8 on now and am wondering if I could be missing some targets by keeping the 4x8 on when the ground is pretty good? Thanks.