Personally I would and do run the torugs over dragon for trials unless you're running with a regular group and have those warhorn rotations finely tuned as youll get a more consistent benefit from it on bosses where it counts.

Obviously knowing mechanics is a huge priority. As mentioned above the harder vet dungeons are excellent practice!

change your friendly/enemy effect colors in your options. changing my enemy effects to a bright solid hot pink and my friendly effects to a bright solid cyan blue upped my performance quite a bit as getting in and out of things was much more apparent..there are too many non-threatening and also useful red effects for that to be a suitable color.

always remember that the more you dance around and move mobs and bosses, the less time your dps is maximizing their dps output, the longer it takes to kill stuff, the more chances to die. Trying to keep them as stationary as possible while also avoiding any big mechanics is key.