A lot depends on other factors with your setup...and how tight all the air seal/compression is.
On some AEGs, with various setups (you don't specify what kind of spring guide, piston head and inner barrel you have...which influence the final FPS range)...have resulted in 300-340fps with a Modify S90 (again...lots to do with other parts in the setup)...and 350-375-ish with a Modify S100 spring.
So...I'd recommend getting a Modify S100 and a S90. Springs are cheap, they don't go bad....but if the one you buy is too hot, it sucks to be stuck making a separate order for another.
Or you could try a Modify S100 and if it's still to hot, turn the spring around. It might drop it down enough. But I've had mixed results from doing this...everything from a 10fps to 40fps drop (pretty much a complete wild ass guess)
Tyson
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