The stingray is fine, imho. It's dead if anyone catches it in close-quarters, so it has to backpedal a lot out of combat to use it safely. It has it's pros and cons, whereas in pre-patch it was a straight-up liability to use. I don't think it needs a re-nerf, there's enough things in Sploot 2 that need a good buffing as is.
There's also this thing that might have given it an illusion of fast rotation speed: technically the further the Stingray user is from it's target(s), the faster it rotates. The beam is emitted from it's user and travels in a straight line, and at a longer range the beam rotating will have a much bigger impact making the Stingray much more effective. This is something hard to explain with just words, so I've made a little drawing for those still confused about it: