For each level of potential, the Cap is a Potential Score-value in the range as stated below.
I prefer simple Potential Exploitation, not Potential Score.
If:
PE - Potential Exploitation
PS - Potential Score (Your formulas)
then:
PE = PS/2 - 4
Then we have in comparison:
Caps: PS PE
0 announcer: 10 1
1 bench-warmer: 10 - 12 1 - 2
2 role player: 12 - 14 2 - 3
3 6th man: 14 - 16 3 - 4
4 starter: 16 - 18 4 - 5
5 star: 18 - 20 5 - 6
6 allstar: 20 - 22 6 - 7
7 perennial allstar: 22 - 24 7 - 8
8 superstar: 24 - 26 8 - 9
9 MVP: 26 - 28 9 - 10
10 hall of famer: 28 - 30 10 - 11
11 all-time great: 30 11
It's easier to understand.
I used it here:
http://bbtools.x10.mx/potencjal/