How much line to let out behind a downrigger?

[Kent]

I ran my line back from 45 to 60 feet today at Srawberry and anywhere from 10 feet to 19 feet down. I didn't have any problem getting bites, and previously I would have run it back from 100 to 125 feet. Most of the time I was fishing in water at least 35 feet deep, and often around 75 feet deep. I have been fishing sometimes when the prop seemed to attract fish to it. If I let out much line I didn't catch fish, but if I fished close behind the boat it was non-stop action.
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