Generally Lipper, Grassies and Snapper using float line methods the fish are taken many metres off the bottom, regularly mid water or even only a couple of meters from the top. With braid many fish are not hooked due to the tension coming on too quickly and the fish dropping the bait, with mono by the time the fish realizes that all is not right you are setting the hook as we are feeding line out in free spool mode, on Fraser we used to call it the Zooms when the fish took the bait and ran. In most cases all of the larger fish of all three species have been caught on gravelly bottom or off the edge of the reef, Lippers and big Grassies generally patrol the sand between reefs and bommies and rarely directly on the reef, local divers here also say the same. Off Tempest generally late afternoon or early evening in 80 or 100 metres of water if we didn't catch a snapper by the time we hit 50 metres we would reel in and drop again. After many missed hookups we went back to mono and had far more success. I use braid in 30 m and deeper but in saying that I've been known to use leader up to 8m long with better success, minimum I would go with is 3 m.