Try looking for the 1000rpm problem.
I had the same issue over and over - silent running at engine setting '1' never worked, they still 'saw' me.
A change somewhere in a .cfg file modified the engine rpm's so they really would be under 1000rpm in silent running did the trick.
Sorry I can't be more specific - I'm only throwing this out there because some of the smarter people here may know what I'm on about.
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