You just need to educate your dps. When i play tank i always put number. If you aggro 2 before 1 i take it back. If you do it again, that mean you can deal with it and if you can't you char die that's all. I used to it in amdapor (the first one) and i had no problems with dps. If they flame i just tell them what happen and if they do it again it's their problem not mine
For the record i main dps and when i'm taking a mob, i now i can kill it alone. If you aggro everything and can quit or deal with it then you don't know how to play your job.