You're welcome. Side note: even with a softer spring, you'll want to use those .25s anyways if you have the chance. Heavier BBs (up to a certain point) will fly just as far or even farther than lighter ones (warning, physics major here: the force of subsonic drag is proportional to the square of the projectile's velocity, so lighter pellets may start faster but lose their velocity much more quickly), in addition to resisting crosswind and cutting through foliage more reliably. In short, you'll want to use the heaviest BB that your hop up can lift, .25s work well in that regard.
Airsoft is where expensive things go to die.