I do not see the picture, however in my experience varying L1 / C10 changes little, that is, with L1 = 2 or 3 turns and C10 = 10pF or 22pF the result does not change, outside of these values, the LRL is not working. It is not possible that the LRL is sensitive to iron. You should bury a piece of silverware (some coins or a bracelet, or even cutlery) 20cm deep and wait a few months, then you can try the LRL. Keep in mind that the LRL must be calibrated for maximum sensitivity before it goes into self-oscillation and which is sensitive to the compass effect. I place again here an aid to tuning.
Regards
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