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My downrigger is on the back corner of my boat and I can see it clearly on the sounder.How big of a ball are you using? Maybe it's too small and it's getting pushed way back at trolling speed.
Transducer might have to narrow a field of detection also.
Even at 120' depth my cable was never at 45deg to the stern at trolling speed (kings-1.5kph, silvers-3kph). Might be trolling a little fast?