Why would I look at parameters that aren't involved in what you are proposing to change?
Pip has one chance to make the shot in a second. If he misses, he has to wait another second.
With Seris you have ~3 chances to hit in the same amount of time.
To me, a speed increase with the smaller time between shots is more significant than raising the speed of a shot that has longer delays between shots.
You're right, it's tough to determine what's OK without actually putting it in action.