Originally Posted by Throttle-jockey
Here you go.
It looks like you are really close to an optimal position. If you only need a few degres of movement, I would grab the light and gently bend the bracket. If you are more than a few degrees, I'd recommend unscrewing the heatsink and flipping the mount bracket 180 degrees.
Could you describe the flickering you are seeing with the lights? Does it happen with the high beam on?