Welcome to the forum unhygenix, and good job with your catches.
Rig are not overly difficult to catch. The main tricks to improve catch rate.
– Use either crab or crayfish for bait.
– Fish change of light into night (although they can be easily caught during the day)
– They do not mind dirty or discoloured water.
– Vary your casting distances, I suspect sometimes they stick close to the breakers, other times they are further out.