Did you guys actually calced the difference if you use 180 crafted chest + 200 weapon? Nothing against your maths and I'm at work right now so I can't do the maths on my own but if you meld 45 Crit on the 180 chest, this is 7.2585 Int. I did not count the massive Det gain and losing some Spell Speed. You also get rid of the Accuracy.

If you add the 45 Crit from melds + the 200 weapon, you are at 36.7135 Int. You have not count the Det yet and Spell Speed from that chest. THe lost of Spell Speed is not greater than the gain in Det. Your actual best path is iLevel 200 Weapon + 180 crafted chest if you are aiming for pure damage.

Can someone check it?