hm well like renduin i would go for 160/60 max instead of too much IAS, cause u will run out of ammo all the time. i think biggest stack for javs is 80. And if u ever played a high ias Bowzone u know how fast the ammo is gone...
Ok sure, if u can afford it u can use another set of cruel javs on your weapon switch to double your ammo...
Oh and i would also try wartraveller instead of waterwalk, might be a greater damage bonus.