I hosted a seminar event with Dave Moss over the weekend and on the side we went through my ergonomics due to a struggle I've had with my left shoulder. Found that in the current position with the stock bars, it makes my shoulder blades arch and push together which puts a lot of tension on the delts and back of the neck.
For my torso height and arm length, moving the bars forward an inch and up an inch sets my shoulder blades into a neutral position, allowing me to relax more, and shift an angled screwdriver grip on the bars to a move preferable and accurate flat grip.
You want the screwdriver grip when you are cranked over for your inside hand as it allows the arm to collapse and gives finer control, though the outside hand stays in a horizontal grip. When you're straight on the bike though, you want the horizontal seating within the palm as this allows for greater strength and accuracy with counter steering and sets the wrist in a better position to allow for cleaner tendon movement across the back of the wrist.
While straight up, if you have the bar diagonal across the hand with bottom corner part of the heel of the palm on the bar, this places the inside of the bar straight across the muscle between your thumb and index finger which whether you notice it or not, causes you to steer and apply pressure WITH your thumbs which is weaker, and will cause hand fatigue.
Your bars being in the right place for your body can be the difference between being a bit worn out after a track day and being fucking shattered.
The first thing you do when you jump in a car for the first time is adjust your seat and steering wheel yeah? So why don't riders in general sort their ergo's on the bike.
I've found the clip ons I'm getting. Woodcraft 7/8ths with a 1 inch rise and 7 degree sweep.
Weighted bar ends, and a reservoir clamp.