Hoy has since moved back to a slightly wider bar. Nowhere near what "conventional wisdom" recommends though. I think he went from 36cm to 38cm, I believe.
I use 42cm on the road and 38cm on the track. I have 44 or 46cm wide shoulders. At one point, I was using 44cm wide bars; I went to narrow bars to get a bit more aero and a little narrower to maneuver better in a field, then found I liked them much better for sprinting.
__________________
Cat 2 Track, Cat 3 Road.
"If you’re new enough [to racing] that you would ask such question, then i would hazard a guess that if you just made up a workout that sounded hard to do, and did it, you’d probably get faster." --
the tiniest sprinter