Yeah, I understand what you mean. A weak spring will translate into a ridiculous ROF. But still in terms of BB velocity, I like to have something that travels to its target a bit faster for outdoor games. I like to keep distance between my target and myself if possible. And it will allow me to use heavier, more stable BBs too.
We have no indoor facilities around here, so the likelihood I'll be playing indoors in the forseeable future is pretty slim. Still though, I'm more than happy to get my 416 in the 340-ish range for outdoors. I'm no power whore that's for sure...