This is a sweeping statement but improving your sea fishing is all about making small changes to improve your chance of catch that 30lb Cod or 10 lb Bass.
This simple tip can be used inshore and when deep sea fishing. Its as easy as to start using round torpedo shaped sinkers when using lures.
Leads with flat sides are generally used for bottom fishing. The flat side allows the lead to lie on the bottom and reduces it chance of being moved by tidal currents. The flat sides tend to cause the lead to fly in the water and cause your gear to fish away from you and not directly below you where you want to fish.
The torpedo shaped lead is streamlined and when you release it to the bottom it follows a true course, allowing you to fight the tide and wind drift and get your gear below the boat and not off to one side.