The only skills I use from other classes often: Raging Strikes, Physick, and Virus should the tank get scary low.
As for dps:
I've done alot of parsing using the addon, but it's not an exact science. BLM do reasonably well on dps if we don't move. Full Darklight, with artifact, pulls about 175-200 in a real fight. That's alot. On a real fight, say primals, people don't really do more than 200 dps because of movement issues. That's with amazing gear. If you're just at 50 you'll be about 100-130. Without relic and mostly blues should be 130-175.
The people in this thread that suggest they do more dps than this on a real fight are likely just number crunching. I've never seen anyone even close to 300 dps on a real fight. (bosses that die in 3 minutes I don't count). Even your number of 225 seems unrealistic.