You would be surprised, I've yet to see a vaper that doesn't use enhanced bio torp with HY.
DDIS threw a fit they nerfed torp spread one time, when it one shot targets through full shields.
I just see it rarely in hilbert leaderboard, and i think i'm yet to be destroyed with somebody elses HY in s9, s9.5.(i vaped myself few times with grav HY3 when damaged)
But yeah, on s9 start I used HY1/TS3 bio-grav combo(like in this match https://www.youtube.com/watch?v=JD1sW-ff42I ) but when i saw that people that never used torps started using bio TS3 just for extra "DPS" and with omega shearing i stopped using it.