bit late into the convo guys,i do heaps of deep dropping,in 300m+,and i was reading on what weights to use,baits etc,in my experience anything that is concrete or brick is shit,it loses abot 30% of its weight as soon as it hits the water due to being a porus material,its a pain in the bum to transport out there and you always manage to scratch your boat, i use rio bar in 30cm lengthss or 4lb sinkers i found is the best we tie it on with 50lb mono incase we need to snap it off. for rigs we use 250lb main line with 130lb droppers,we use sleeve swivels to attach droppers to the main line and crimp it ,a decent ball bearing swivel at the top of the rig and a swivel at the bottom, and we always use circle hooks, for bait i use half a fillet of mullet soaked in tuna oil,fresh kingy or cuttlefish trick is not to clog up the circle hook or they wont work iv been using rod and reel for the last couple of years,the two iv used is a tld 50 2 speed and a saltist 50, iv got an electric that i use in 400m+ but anything shallower we go old school. hope this helps you out