You forget to mention what colour cons the mobs you were fighting. If they were yellows or even oranges, you will get a good number of taunt resists, and HTL line of spells does not activate everytime the mob hits you.
If you were fighting higher level mobs, then you are SOL, since taunt resists are included by design.
Remember Guardians are unsung heroes and excel at hate generation and maintenance, more so than any other fighter, according to Moorgard anyway. The reality is not even close to this, as you seem to have experienced.