Loose the fish finder. Use a high-low or any other rig that has your weight at the bottom of the rig so it doesn't helecopter in flight. I've even seen people just tie two lengths of mono to a swivel, one a bit longer than the other, with the sinker on the long line and a hook on the short.
Think about where you're fishing also. If it's off a bridge there must be some decent water/current, you may not need to cast all that far.
-spence
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