Farmer , the best artificial lures for Garrick are the Aubrey Da Gama chisel nose plugs. You get them in wood and plastic. The sizes required for the tackle you have would be 4 and 5oz plugs. Be sure to replace the ready made up rigs with flourocarbon line of 40-60lb. Cast them of at first light and last light of the island for best results for bigger garrick . The smaller ones tend to stay longer in the area and is big fun on lighter tackle and 2oz plugs.
For kob , use rapalas with weighted hooks and reel them in slowly for best results