I've had agro issues for 2 years now myself. Now it's only gotten worse. In a burn it's mostly bloodlust and DoT spells that makes agro go way overboard.
In missions when I burn I'm also generally the tank. It just works easier that way

I don't even have most of the ToV AAs yet. With the upgrades like gelid rending I expect it to only get worse.
On raids I chain FDs and the new FD is nice about 15 secs in a burn to really give the tank a head start. I still continue FDing even after that too though.
Paladins have a deagro buff..Marr's salvation iirc. It helps some.