We just switched from the standard keeled 10lb ball to 8lb keeled pancake weights. They are 1" thick and about 7" across with a 6" keel. They cut through the water like a fin and work well in high currents. They also prevent line twist alot better. $14 at sportco. I'm sure a 10 or 12lb would work even better.
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Occupation: I pet the fish.