Motor mooch. Cut your herring into cut-plugs and slow troll through the same mooching holes. You will need more weight to keep it down. Another methed is "strip casting" where you cut your herring into plugs or strip. Let it down to desired depth, and then quickly strip the line into your boat(carfull not to tangle it on anything). Once it's to the surface, let it down as fast as the weight will take it. Guide the line through your fingers so you can feel the bite and set the hook. The bait should be rolling on the way up and down. You could also jig your own herring and fish it live.
