I have had great success with the Castaic Threadfin for large spots. It covers alot of water and spots seem to really like it. You can fish deep water with it by carolina rigging it. Just make sure to use a 6-8 foot leader. Kind of a pain to get used to, but it works great. I have dozens of spots over 5 pounds caught on the Threadfin. Also, not a swimbait, but the old style Castaic Craw works wonders on big spots. One of my two 7 pound spots was caught using the Craw. Good luck! JT