I have a few issues with this.
For one, you are well known that all FF dungeons are very small in terms of running around in so I don't find it very believable that you have had to "Chase" them down like it was a game of cat and mouse. Second, you are a tank main which means tank stance on equals no aggro problems if the dps are dying it's cause one you aren't hitting the mobs or your stance is off. There is a emity list available on your hud display if you aren't sure if you have aggro of mobs or not. Use sprint when pulling wall to wall. There have been countless forum threads created like this and the best advice I can give you is "It's not that big of a deal" you have the tools to be a tank nobody is preventing you from doing your role.