its still OP shock, your not getting it.

By your idea this is how it would look

Lowest chance would be 3-3-3-3= 12damage,
4-3-3-3 = 13 damage
3-4-3-3
3-3-4-3
3-3-3-4

3-3-4-4 = 14 damage
4-3-4-3
4-4-3-3
3-4-3-4

3-4-4-4 = 15 damage
4-4-4-3
4-4-3-4
4-3-4-4

4-4-4-4 = 16 damage

That is ever single possibility and the range would be between 12-16.
With the ROF of a pbp with the damage your still getting less than 5 shots per kill and that dosen't help the current situation, it would still not make anything better.

next idea would be 2-3 damage

all the possibilities would be
2-2-2-2= 8 damage

3-2-2-2 = 9 damage
2-3-2-2
2-2-3-2
2-2-2-3

3-3-2-2 = 10 damage
2-3-3-2
2-2-3-3
2-3-2-3
3-2-2-3

3-3-3-2 = 11 damage
3-2-3-3
3-3-2-3
3-3-3-2

3-3-3-3 = 12 damage

That would help things a lot more as the 9 damage would completely screw people over making the gun a 6 shot gun

make the clip 4 or 5
with a 8-9-10-11-12
all completely random within 1 clip. it can be a different order 8-9-10-11-12
a example would be
shot 1 = 12
shot 2 = 8
shot 3 = 9
shot 4 = 11
shot 5 = 10
these orders could be changed around again and again.

This could work