I had the same problem with my K9AY loop. Despite being in a wooded area that seemed to have very damp soil the earth conductivity was poorer than I had expected.
I added eight short radials under the loops and that made a huge improvement. I also added some cheap CATV ground rods to tie the ends of the radials down. Nulls are fairly decent at present, but I may try adding some cheap chicken wire under the loops for the heck of it, as an experiment. My loops are near wire fencing for a field for a local horse farm, and the tower and inverted L are about 40 and 60 feet, respectively, away. I am not sure on the vintage of your loops, but the newer versions have adjustable termination resistor choices... I have read where others have found much better results by changing the terminating resistor to match their own soil conditions. Unfortunately mine was a very early product and only had a few fixed values that is not remotely selectable. I think I am blessed with a fairly quiet rural location, since generally stations are equal on either the K2AV system compared to the loops. Pete W1BR _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector