i was able to solo the first 3 bosses of Terrace on 25M heroic, i couldn't kill sha on 25 man due to not being able to kill the adds before they reach me and 1 shot me. im going to try and do 10M heroic this week and see if that fixes anything. I did mogu'shan vaults and Heart of fear on 10M heroic and was able to clear both( took me 3 times to kill empress but my dots were able to finish her off after i got fear-locked). i did it all on my 843 guardian druid. im going to try out ToT later this week