Tanking gets rough at about 30 - its the time where dds start getting the bigger, badder abilities, but tanks get nothing. It's just an odd time.

It all straightens itself out when you get Shield Oath/Defiance.

In the mean time, try marking targets, and if the dds don't obey, watch them - if they are single targeting, move on to your hate combo. If they are aoeing, continue to spam flash and your MP regeneration combo.

If its a bard mocking you, you're just going to have to deal with it. At that level, there is not much you can do to keep hate off of a bard if he really wants it.