You're trying to tank against level synced archer/Bards who unload all their cooldowns at the beginning of the fight because they don't care. All you can do is keep your equipment up to date, start a fight with shield lob, flash a couple of times if there are a few enemies on the pull, and fast blade > savage blade and pray.

And it won't matter, because on low level dungeons, the archer/bard can tank the whole thing if they wanted to anyway. Keep your chin up, get Rage of Halone at 26, Shield Oath at 40, and life will get better.

What I tell tanks to do in my low level dungeons as I level DRG, is once I pull hate, just start on a new enemy because you aren't getting it back. By the time we're done focusing down the first mob that I'm tanking, the tank has pretty solid hate on the remaining enemies.