mud is variable and therefore suitable tyres vary. whats good in one area may not be good somewhere else.
I`m an advocate of skinny (ish) tyres in the mud. a fat 2.5 will float and you will lose grip. much depends on type and consistancy of mud in your area.
the sandy clay in the surry hills means you can pretty much go nuts. the swampy loam in stamner/wild park needs a tyre that cuts through the slime/slurry/sludge over.
relax, brake less on the slippy bits and more where its grippy and look ahead not at the roots you are riding on.
i find i need to be a bit more dynamic on the bike when its really sloppy. if i ride like its dry i tend to bin it.
i love riding the steeps when its wet – its a real test and generally as its a total shitfest the landings are soft and the crashes are comedy. We dont have burly or rocks local to me so super-tech is the next best thing.