I'll take a guess on this one , maybe it is too much weight on the second piece , you should try to take from there and put in front. Still the problem may be from the hook placed at the back of the lure that adds to much weight and stops the movement , if you cut from the weight placed on the second piece you may have a chance that the lure starts the S movement from there. Another way to solve this is "think slim" maybe your lure is too fat
there was a post some weeks ago about swimbaits , I'll give it a search