I read the OP, and apologize for not reading the remaining 6 pages.
I love trying to find ways to pop TBN. I think what we may need is more of an incentive to use it.

Outside of a Tank Buster, throwing TBN on yourself or another player is never necessary. If I throw a TBN on my healer during raid wide damage, they probably weren't going to die in the first place were going to throw out a heal anyway. I'm creating extra work for myself to no real benefit to the party.

If Dark Arts gave me a damage boost to my next Edge/Flood, or maybe had a reduced mp cost, resulting in me getting an Edge/Flood at a discount. I'd be more inclined to use it. Until then, I'd rather not gamble my dps if my extra work at using TBN wont result in a different outcome.