I didn't realize there had been tests done, that's actually pretty useful info.
If it's 10 second duration could be useful if planted right during the animation for a SC (even though some groups just Kraken burn Bv2) but I suppose if you're kraken burning Bv2 you aren't worrying much about accumulating MDB nerf
Setting up the -resistance nukes with BLMs seems to be the happy medium for all of this, either way damage or spell# the spamming ni/san cycle may be too much (even for just one element)
For the advantage it can give when added with threnody I'd say it'd be worth trying to figure out a nice cycle that works between your NINs and BLMs.
One thing I have always wondered though, if the Ichi/Ni/San spell does 0 damage to the mob, does the magic effect still proc?