I've always been told that you cant get very deep without a downrigger when trolling a flasher...Maybe 30 feet or so...Balogna!!!...I fished Sekiu over the weekend and trolled with the current, with a 10 oz weight and flasher and was going deeper than 50 % of the line being let out...All weekend!!! At one point i was running 60 feet down with 100 feet out...I was using power pro line, which definitely trolls deeper than mono....My guess would be 25 % or so deeper.
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Engage your brain before you throw your mouth in gear!