After reading this excerpt from the update details:
"The amount of TP a character deals to the target will now decrease proportionate to his or her AGI."
I began doing some limited, brief testing of how this change works. I used a Relic Dagger (DMG:1, Delay 999) in order to have the largest amount of TP per hit to work with, in order to help with math.
According to the standard TP formula, my TP per hit is 17.9, meaning the target will get 20.9 without any subtle blow (before the update, that is).
Base AGI: 80 (85THF/42BST) >> Charm used to do a TP check via <pettp> command.
Target: Sylvestre in Buburimu Peninsula.
My attack gave me 17 tp, as expected. An immediate charm and /echo <pettp> shows the Mandragora with only 11 tp instead of the expected 20, which shocked me. I equipped some limited AGI gear in order to see if the effect would grow -- at 100 AGI the Mandragora was getting 10 tp instead of 20.
According to wiki, subtle blow caps at 50%, so my next step was to test if this new adjustment was converting AGI into a hidden Subtle Blow effect. I grabbed 10 Subtle Blow in gear that would not alter the AGI gear I had on as well, and went to test.
With the additional 10 Subtle Blow, the Mandragora only recieved 9 tp from an attack that should be giving it 20.
Unfortunately, I am unable to continue this test with a Job that has native Subtle Blow traits to see if the two "abilities" stack to give a 75% reduction in TP given, but my limited testing seems to suggest that the two effects will indeed reduce the expected TP per hit below the previous 50% limit. My guess is that the AGI portion reduces the base TP given, and subtle blow takes over from there.
Is there somebody who can confirm this/check my math to make sure I'm not missing something? Thanks in advance!