If anyone else watches the track then fast forward to the end as it goes wrong at his destination airfield.
Heres what i thought i saw,
When you went into hover mode you were offset from the runway heading, you applied yaw to the right to line up with the runway heading still in hover mode, the new heading was held but were you holding onto the rudder for this?
You descended slowly whilst maintaining the new heading, at about 3 mtrs in the dust the helo banks back to the left as if it is trying to get back to your origional hover heading which was offset from the runway heading, trims are not neutral.
I hope thats how i remembered seeing it.
EDIT - Screenshot added