As for the tanking part: You may have been grouped with higher level, better geared players. Even with level sync it can influence. And yes, low level dungeons are so easy that even a mage can tank sometimes. I started with Gladiator and was my first lv50, my advice is use flash in between your weapon enmity skills rotation. retaking enmity with no a lot of enmity skills in low level dungeons is a pain, but it gets better/easier.

As for the forum limit: Yup sucks, but there is a loophole. Just write everything you want, if you get limited, post it anyways, and edit it asap, on the edit post yoh won't have the 1000 character limit. : )