Another thing that BJ Cole pointed out in my playing was that my vibrato stopped and started whenever my concentration was taken up by something else: pushing pedals, lever, picking. even just moving the bar.
He encouraged me to try and maintain vibrato at all times and just vary the frequency and depth.
Kind of reminded me of what it looks like to play a theremin but i’ve never played one.
Difficult thing to do, keep the vibrato going with all the other stuff to do, but practice does pay off.
I think the most obvious place where I noticed this was sliding between notes but keeping the vibrato going. Just makes everything a bit more cohesive.