I never got sourness out of WLP530. Could be a water or mash pH acidity thing? Could also be contamination. It should not be sour.
Also, after 7 weeks, it's done! It's not going to change considerably in the fermenter anymore. Keg or bottle today and start drinking!
Or if you don't like it, add fruit, or spices or herbs... or dump it. I've done that too many times to mention. It happens. Better luck next time if that's the case.