If you are limiting off of any dock, pier or jetty, you are doing it better than me!
20 is the place, generally, unless you want to run down to Tokeland. Same drill there, but Westport has more area's to choose from on 'Fisherman's Walk', which is 20 and beyond.
Took two guys out for 4 hours with a few different set ups and got two, yes, two, 'keepers'.
While it can be 'pretty good' at times, don't get your hopes up too high, or you may have a fall a comin'.
You will get many crabs, just not male, and if male, not legal size, or soft. Hit and miss.