By the way you did not gain 25 TP return on your last swing. You fell short, you do know it takes a ton of Store TP to raise your TP by 1% correct? Well usually without the +21 Store TP you are stuck at 99% after the 6th hit, so even if the mob gave you 1%, you fail. Do the test with /nin, chiv chain instead of brutal, and shadows next time, against something that does no damage to you.
Base TP = 5.0 + [(Delay - 180) * 6.5] / 270
TP= Base TP * (1 + StoreTP%)
Final result is trunkated to the nearest tenth.
http://wiki.ffxiclopedia.org/wiki/TP
Store TP IV=25
Store TP Merits=10
Rajas=5
Brutal=1
Hachiman Sune-Ate=5
WS hit 1
TP=(5.0 + [(450 - 180) * 6.5] / 270) * (1 + .41))
TP=11.5 * 1.41= 16.215 = 16.2
Swing 1 hit 2
TP=(5.0 + [(450 - 180) * 6.5] / 270) * (1 + .46))
TP=11.5 * 1.46= 16.79 = 16.7
Swing 2 hit 3
TP=(5.0 + [(450 - 180) * 6.5] / 270) * (1 + .46))
TP=11.5 * 1.46= 16.79 = 16.7
Swing 3 hit 4
TP=(5.0 + [(450 - 180) * 6.5] / 270) * (1 + .46))
TP=11.5 * 1.46= 16.79 = 16.7
Swing 4 hit 5
TP=(5.0 + [(450 - 180) * 6.5] / 270) * (1 + .46))
TP=11.5 * 1.46= 16.79 = 16.7
Swing 5 hit 6
TP=(5.0 + [(450 - 180) * 6.5] / 270) * * (1 + .46))
TP=11.5 * 1.46= 16.79 = 16.7
Total TP = 16.2 + 16.7 +16.7 +16.7 +16.7 +16.7 = 99.7 = FAIL
But somehow on your 6th hit you got 25 TP? Lets figure this one out.
25TP=(5.0 + [(450 - 180) * 6.5] / 270) * (1 + X))
X=2.18
2.18 - 1 = 1.18
1.18 - .35 (Store TP IV and Merits) = .83 = 83 Store TP
You had on +83 Store TP in Gear and/or food to gain 25 TP on your last swing, without getting hit, without using meditate. Please tell me how you do it.
And an FYI Store TP also applies to the TP gained from being attacked.