I didnt really read anything, but my .02 are, wouldnt it possibly make sense to put a cornerworker station to the left/behind the tree in 7? That way its RIGHT in the line of sight essentially for people once they are past the apex in 6.
Granted, I know you cant cover every inch of the track, but theres alot of room to be covered between the top of the hill in 5 and before you get in view of the treehouse in 8.
