Look up bora gaming on the tube of you he does a vid on when jewels or ohms are better. He explains it pretty in depth... i believe the way to figure it out is take the base of ur weapon... so windforce is hydra bow... figure out the avg dmg of just a plain hydra bow... then take a hydra bow with 50ed(ohm) n figure out the avg dmg and then do hydra with the ed/xx jewel and that will give u ur answer... also pretty certain it works the same with axes n swords... basically just look up bora gaming he has ur answers