She can't invisifire anymore, sadly. It's a damn shame, but life goes on. I retired my Blysk after 1000+ matches due to the OWSF nerf. I'm not bitter about it, I just prefer to remember her how she was.
That being said, my advice for taking on USN DDs, is to get them to chase you. The Blysk is faster, and more importantly, it has 4 guns in the rear vs 2 guns in the front of USN DDs. If you fire 3 torps to both sides of them, alot of times they will go broadside to try to get more guns on you, and run into them. Definitely keep them outside of 7km, or they will out DPM you.
The Blysk also has an excellent Alpha strike, so don't be afraid to take a shot at any DD or CA with under 3k HP left.
I do plan on bringing her out of retirement if WG decides to give her a little love, since they really hurt her with the OWSF nerf. I would prob use her in a T7 Ranked season too.