Overkill

If you can get top 10 in scl 8, you can do it in scl 9. Play Slice 1, 3 or 5 in scl 9.

For scl 10 PvP, I'll save you all the trouble. 

Slice 1: 1200 points might net you top 50, but often, it's top 100.
Slice 2: 1050 points might net you top 25, and sometimes top 50.
Slice 3:  See slice 1
Slice 4: See Slice 1
Slice 5: Similar to slice 2 and you could get top 10 with ~1100 points.