No need to test any fin:
Here is the scoop:
From the top 45 pro in the PWA Slalom circuit:
Deboichet Sl4 over 15-20 of them,
Vector Fins Canefire over 10-15 of them,
C3 Venoms over 5-10 of them.
I ride Canefire from Vector Fins, But If the Deboichet were easily available I will be using Deboichet SL4 in bigger sizes and Canfire in smaller sizes. But I have not found any difference between Vector and Deboichet via GPS reading in that board.