Yes mate! They are the most productive hours but in saying that, my last two over 80’s, were in the same area in the middle of the day!
With your setup, the main thing I’d change would be your reel size. A 4000 reel gives you that bit more grunt to turn the fish. Don’t worry about 10lb. Your jigs are fine with that depth. But in shallower water I use nitro tt 1/4oz 4/0xh matched with a 5inch and 1/4oz 5/0xh with 7inch and sometimes a 1/6 weight. My favourite go to lure is a zman 5 or 7 inch shad in coconut ice! Deadly! The other part of sps is keeping the lure in the “strike zone”. Believe it or not I actually don’t impart much action at all. A long cast is more important. Let it waft, then long high loops always maintaining close contact with the line. Once your close to the boat wind in fast and you’ll be surprised at the bycatch( kings, bonito, trevally etc) then repeat process!
The other thing, is work those drop offs like rick suggested. Bait will either sit on top or push hard against the ledge. Snapper are opportunistic fish and will sit under waiting for an opportunity! A nicely presented sp or fresh bait and your on! Hope that all makes sense!
Cheers scratchie!!!