First thing I would do is check your same locations, but pull out to a little deeper. Crappie will spawn deep(er) also.
Then I would start checking other locations of the lake....lower and middle.
There was a good article a while back in Crappie magazine about a guy (can't remember who - but one of the pros) who mainly fishes deeper around spawning areas to avoid fish that get hammered in the shallows. He used a jig & bobber combination at times with two rods (one in each hand) and basically just slow trolled those deeper areas just out from shallow spawning areas.
Hope this helps.