If you haven't already, try a Slow retrive, i.e. cast, let your bait sit for 30 secs...the twitch it a couple times, let it sit for 10 or 15 secs..then retrive with 1 or 2 slow turns of the reel..as an example, but slow is better than fast in colder water. Also, if possible to do so, try dropshotting wacky style with a senco or finesse worm..that'll get em..