I D FILTER QUESTION on racer 2

[Calabash Digger]

I like to run my machines open so I tried a low filter 1 and 0 and 10 today. I went to a iron infested site with the 5 x 10 coil but seems like I was getting a TON of falsing on iron with the filter set so low 0 and 1 that is. Anyone else noticed this? I had gain on 85 maybe I should have lowered it and it might have helped with the falsing. 3 tone is the progam I was in.

 

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