I love combi rigs and mine are made with 15lb Korda IQ and 15lb ESP Sinklink, this makes the majority of the hooklink invisible but with the vital last bit nearest the hook supple so it helps turn the hook into the bottom lip (in theory ).
One final word, i split the hooklink into thirds so if you want a 6 inch hooklink then you need 2 inch of braid nearest the hook then 4 inch of IQ for the rest.