I noticed what I believe to be an error in the THF spreadsheet, on the weaponskill tab. The WSC value in set 1 and 2 were different, so putting the exact same gear for both was giving very different numbers. The WSC were values and not calculated with a formula using the attribute modifiers.
Plus on the data tab, Tauret crit values only update on set 1, set 2 does not work - cell B/C-214-216.
Sure you can check if I am right, I'm no expert!