DET also affects base damage, as it's a coefficient of damage, from my findings at least. If I were on my PC I'd give a much better answer, but I'm currently solving the formula as (WS*A+1)*(STR*B+C)*(DET*D+1) and my formula for the Dragoon thus far is very accurate.

The thing is, that every job scales damage differently given the same baseline of stats. My issue is finding out whether each job scales A/B/D coefficients differently, their base damage value, C, is different, or whether there's am external coefficient that multiplies/scales damage per job.

All the info so far is on my WordPress Blog if you wanna check it out.