I am now unsure whether to trust this or T0rin's summoner research when it comes to stat weights. T0rin found det to be superior to crit even when it's at a 2/3 to 1 ratio, and there are no reason for the stat weights of det and crit be any different for BLM. It's not too important now since our gearing choices are minimal and we really can't optimize for both spell speed and determination due to our itemization, but such knowledge will definitely come in handy in 2.2 when we get more options.
It's not new, the informations (most of them) in this spreadsheet are wrong since the begenning. The OP used a bad formula (which was supposed to be true when he used it) and say he "tested" everything w/o show a single data and everybody said bravo.

From my own test and the last formula found (the one used by T0rin), the stat weights are something like WD = 6, INT = 1, DTR = 0.28, CRIT = 0.18/0.19 (i dont say anything about the SS, because i never knew how ppl calculated it, so i used the puro's values in my spreadsheet)