Just out of curiosity (and ignorance), is there any special tuning or differences to using the GB 5" coil on an F5? I'm now familiar, a little at least, with the 11" DD. Is it "about the same" or "exactly the same", excluding its size and possibly a little less depth? Any anomalies in readouts, etc.? I recently acquired the 5" coil and have yet to test it thoroughly, so I thought I'd query the "jedi knights of all things Fisher"... Thanks!