lonex m90 spring, modify s100, should put you around 360. Lonex m100 on a stock vfc should be closer to 380-390.
Though if you want it done right you should probably take it to a good tech. There are different ways to achieve the correct fps depending on your approach. You could short stroke a metal rack piston and sector gear with your stock spring. You could install a new spring.
I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.