The hate problem is more or less something still work in progress.
With the current system wich requires "Stamina" for each class to
perform actions hate becomes a major poblem to keep a firm grip on.

Sometimes Provoke for the GLD just isnt enough, the pugilist has a hate control
ability aswell (wich GLD must learn) as an option, then theres one for Shield too.

Some crazy mages like to spam all kinds of spells & thus generates immense hate within seconds.
Same for archers wich is one of the game heaviest DD's.

The "Fatigue" systems is well bad / good depending on you look at it.
You can still gain decent amount of SP during this effect.
If you hit fatigue it's best to change class or get a leve party & share leve at
the Start location to increase the amoun of bonus & also use the "Guardian" boon for some extra % bonus aswell.

Well the level spots contains both soloble & party mobs, it all depends
on how well you play your class & wich class you solo with.

I dont think there's a better thing than "Trial and Error" to learn the mobs
skills & what they do after a certain amount of hits. (it's more or less the same all the time)
As conjurer / Thaumaturge, the "Sleep" spell is your best friend. (it has many uses if it sticks)