Lowest point on the blade's rotation should be 11o'clock if I'm not mistaken. I'de venture a guess that in some wind the blade will come to rest in it highest/lowest flapping points in the disc rotation. All irrelevent if you use the rotor brake. Then the main goal is preventing buying beer for the crew when u stop it off-centre.
I've recently had a engineer tell me that the factory teaches pumping the brake from 50% and applying full rotor brake from 40%. This apparently heats the brake disc enough to prevent the shudder some machines have.
Any opinions on this? I know it works, but since I got the idea from word of mouth, its kinda not enough.