That pendulum cast looks rather complicated and is certainly not necessary for the sort of rock, beach and surf casting I used to do years ago.
6lbs line, you must be mad. In the rocks and gullies I used to fish, you wouldn't land anything on less than a 30 lbs line, unless you where fishing around harbour walls and estuaries and then I would use 12 lb line and fixed spool reels. Even the there was the chance of hooking a garrick which would scream off with 200 meters of line if you let it.
For all round beach casting, a 12 foot medium action rod and a 10000C fitted low down on the rod would do all you wanted.
Although not an expert with such tackle I have seen anglers chuck a 5 oz sinker over 200 metres!! No kidding. I could manage about 150 metres with a simple swing, similar to that popularised by Leslie Moncrieff many years ago.
The secret is to use the reel at the bottom of the rod. It doesn't take long to learn to control the spool with your left thumb, even if you are right handed.
Playing big fish is a heck of a lot easier with the reel at the bottom of the rod. You wear a rod button on a belt around your waist, put the butt of the rod in it and heave. A good star drag is important as is the fact that when you fish from the rocks, NEVER turn your back on the sea, especially on an Indian Ocean coast. Some of the waves can be mountainous and you may have to run like hell.
And never fish alone. From high rocks you need a gaff with a long handle.
Don't even think of trying to return fish in these conditions. A 40 lb Steenbras or Queenie is ample reward for a fishing session. Take it home and eat it.
Lovely.
Such lovely memories of sea fishing off the African coast.