So, looking at you setup...

"shael windforce = 40 ias
15 ias mavina helm = 45 ias
bugged valor = 25 ias or shaft w/ jewel = 15 ias
bugged string = 25 ias
gloves = 20 ias "

Ditch the WF, get Cruel Mat's of Evis. (2 socket)
Cruel Mat's evis (dual 40/15) = 30ias
15 ias mavina helm = 45 ias
bugged valor = 25 ias
bugged string = 25 ias
gloves = 20 ias

You'll have 145% ias which reach 7fpa for mat's bow~

At 7 fpa
380% Cruel Mat's of Evis (63 max) (2x 40/15ias) will do:
20-47
100 - (230+63) = 100 - 293 dmg
Avg: ~196.5 dmg

At 8fpa
Socketing 40/15 max would be best for higher avg dmg since you won't be able to shoot at 7fpa anyway.
290% Windforce HydraBow (with 40/15max) assuming clvl as 99:
10-68
42 - (265+3.125xclvl+15) = 42 - 589 dmg
Avg: ~ 315.5 dmg

Just go Wf, as a 2 socket Perfect Cruel Mat's of Evis is really expensive.