I was thinking about this as well. However I was thinking more along the lines of at 74+ for merit points exp
{EDIT}
Guess I should explain my idea while I'm here. Basically my idea was 2 THF/NIN and 2THF/SAM, 1 BRD, 1 WHM. WHM is mainly for stona,silena, and some cures everynow and then.
A: THF/NIN
B: THF/NIN
C: THF/SAM
D:THF/SAM
Formation is somewhat like this:
D----A-----monster-----B-------C
Basically you have either A or B pull so they keep the hate for the short amount of time for the D or C NIN to SATA + WS onto either A or B. Then it's just bouncing SA /TA/orSATA back and forth onto A and B. THF C and D have /SAM SJ so they should be gaining TP fast enough.
I was also thinking this because of SS like these. . .
http://staronionbrigade.com/weeee/de/de02.jpg http://staronionbrigade.com/weeee/de/de04.jpg
Since what you fight at lvl 74-75 is basically VTs that damage might be possible along with the BRD (which replaces you having to SJ /WAR for that kind of DMG).
Another benefit I saw from this is THFs are able to train their evasion ^^ Plus, I believe they have the highest evasion in game (NIN comming in 2nd if I'm not mistaken) and at 74 they will have access to Utsusemi: Ni.