Hi Mate,
Mud is one of those spots, like most in the bay easily accessible and therefore can be a bit of work to catch decent fish especially consistently!
Best tips I can give you for mud is to do your fishing around sunrise and sunset, these are by far the most productive there..
Night time can be ok as well on the right moon phase/night..
Try and fish it mid week and not in "ideal" conditions when there are not boats zooming around all over the place..
Bait, fresh is best and if you can catch your own that is the way to go...
Plastics work well there, especially smaller ones in that 4 inch sort of range..
There are big fish that lurk around there at times, we have caught lots of snapper there including some big ones (10.3kg) best to date..
As for spots, look around away from where all the boats tend to congregate in water depths between 8 - 12m..
Plenty of bits and pieces laying around out there if your willing to spend the time looking..
But you have to be prepared to put in considerable hours to reap the rewards..
Good luck