Tremolo picking approaches

Hi, I’ve included three examples of tremolo picking as a start. My ability to play lead lines is pretty much on the floor speed wise, so really looking to figure what errors I’m making on my right hand so I can the work on building up fretting hand speed. I think Ex 3 is instructive, in that I clearly move to a different slower orientation when going for accuracy - it’s what I usually change to when trying the Gilbert lick for example.