Jesus christ, stop calling it a damage reduction, there's no reduction on the TF, there's buffs to help it in WOE, and or PVP. I already explained why, and I already explained when it might eventually get tweaked. In fact, if you look, there's actually a "debuff" on suiken by your math, maybe we should make sure to adjust suiken too!
A LACK of buffs, is not a debuff, if the TF had -33% dmg on everything, THAT is a PvE de-buff, because it is actually removing damage from the TF, not leaving the natural damage and increasing something else.
In fact, your user of PvE is wrong too unless PvE took up a new meaning besides "Player VS Everything". The only thing the TF doesn't boost is some aspects of PvM. In fact, it does quite well vs people and some monsters, and with certain gear, even better.