When you hold the L-rods level you cannot tell any difference between a weakened target field and a full-strength field. Adjust the rod angle by moving your wrists only. Best to test conditions with a test target to see how far down you can angle the rods. Once you find that angle for those conditions stay with it and don't be adjusting it as you search. Rod movement is subtle so you will need to practice until you can get a response with the rods at a lowered angle. Besides keeping your conscious mind out of it, this is the main thing skill you need to acquire. So if you are just searching with level rods you are only fooling youself and wasting time.
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