It's not as much of a nerf to the blenderfish as is being implied here. The heavy carronade actually got a range boost and cone tightening allowing it to start blending effectively at midrange. It also got an increase in shatter damage allowing it to be even more devastating against components than before.
Chute vent still works just as well as always, only causing slightly more damage to the balloon than previously. The less than 100 extra damage, is hardly noticeable on the 1400 health balloon if you have competent engineering (not to mention that chute vent is unecessary on blenderfish with a buffed balloon and pilot that can predict their opponent will start descending once the balloon has been popped).
It's previous 220 shatter was more than enough to one shot any component, it's only a marginal buff on its effectiveness against armor and hull if anything, NOT against weapons since it already pretty much had Mercury gun effectiveness against them.
The range boost is laughable. The spread reduction was welcome though, that's probably the only true possitive thing about the changes to the Hellhound.
Reload time of 5.5 seconds is an extra 1.5 seconds to your cycling rate, massive bummer that this gun didn't need and yes it is overshot by a long margin since this gun doesn't bare the fastest reload in the game anymore, which was one of the factors that made it realy attractive.
Chute Vent nerf I realy don't care much about, I just think that the attempts to nerf the Blenderfish, of all things, were hilarious.