The last few levels of any tier are tougher. You should probably still be in TS or Nek Forest for another level or so, (I usually move to the new zone midway through the "8" level)
That being said, the deeper you go in any given zone, the higher level the mobs will be... so my suggestion would be to go further into TS (or Nek Forest)...
That, or you could start soloing the upper tunels of Splitpaw Saga. It is an instanced zone so everything in there will con white/blue to you and you will get about 15% XP for each trip through.
Beyond the XP, the loot is really good - I usually get between 6 and 12 adept 1 spells or advanced recipe books per run.
Oh, yeah, each run through takes about an hour and at the end, you enter the lower tunnels which is a safe place to camp out. From there you can zone to the Splitpaw entrance in TS from where you can start all over again if you just wanna grind!