you need 55 ias. you reach it through hl (20), gloves (20) + either thunderstroke or a ias jewel in your griffon.
you sacrifice too much going for 99 fcr unless you have a fortune to spend on a godly rare javelin. stick with 68 fcr
5 maek from silkweave helps but ml helps even more. try to get 5+ ml on your fcr ring, ideally also 3 ml on your gloves
here's a standard build:
tstroke
griffon rbf
eni
spirit monarch
2/20 ml gloves
razortail
silkweaves
highlord
fcr ml ring + raven
infy flickering flame coh merc
a few skillers, light sunder, some @ res/light res scs