I have done the same...had the NF 20" Mono round...I do have to say I did find a nice solid 15 gram piece about 19 inches down...but thats it..sold it. Had the 18" Elite liked it but a bit heavy , found as few pieces..got rid of it do to terrain I hunt. My favorite size coil these days is 15" Monos...I dont see any reason to have one larger than a 18"...although I am a dreamer...and dream of that huge lunk still waiting out of reach, down about 2-3 feet on some of my worked out areas...and patches. Maybe just maybe....one of these new coils like the X-Coil or Detech will reach it. But I will wait and see what the reviews say out in the field.