I'd maybe have one less split in the ranking, there's only 50 so I'd go with say 6 splits and I'd reduce the scale a little.
1 - 10 points
2-10 - 9 points
11-20 - 7 points
21-30 - 6 points
31-40 - 4 points
41-50 - 2 points
That way the difference between being voted 1st and voted 50th is only 500% vs 1200%.
Using the two scales and assuming Director A receives 7 votes, in the form of: 1 x number 1 vote, 3x top 10 (4, 7, 10), and 3x 31-40 votes
and Director B receives 10 votes, in the form of 6x 31-40 votes and 4x 41-50 votes
With scale A, Director A would receive 49 points, 7 points per vote and Director B receives 22 points, 2.2 points per vote
With scale B, Director A would receive 49 points, 7 points per vote and Director B receives 34 points, 3.4 points per vote
Which allows for more points towards the more loved directors, while not overly punishing the more populist yet less loved director.
Of course, this is just a quick thought and I'm sure the scale is far from perfect but it's a start. Perhaps pix the robot can come up with a happy medium.