I dont think turuj is "too easy", I think us FWF people are spoiled on super challenging end game marza fights. Really, ignoring Prime Enchanter, the tier progression/difficulty is pretty consistent.
Maybe the first tribe could use a little something, but the basement seems fine in the state I last did it.
edit: thats not to say making it harder is bad; since doing so would make sharn'ree and rujik less of a stark contrast to almost everything prior, just that comparing loot and difficulty from turuj to spires and sanctum doesn't seem that 'off' to me.