Since last friday I got 5/5 Pahluwan, so naturally I wanted to test this subtle blow on it since I didn't find any info on it.
http://home.hetnet.nl/~albertdpc/Monk/FullPahluwan.jpg
=D
Anyway I tested this as MNK/WHM. Removed all my additional Subtle Blow gear like Rajas and Black Belt. So that it would just be my Job trait + Pahluwan set.
Spells (at least damaging spells do, afaik enfeebles don't? But that's another topic) give 10 tp to a mob normally, thanks to Monk's Job Trait of Subtle Blow+20 it becomes 8 tp per spell. I brought my BST buddy Shina to La Theine where he would charm some mobs for me. I first casted Stoneskin+Blink on every test to make sure the results weren't messed up by tp gain from hitting me. Then I did Dia, Dia 2 and/or Diaga, usually just did Dia. Dia follows the 10 tp principle since it does damage =)
1 hit: 7tp
2 hits: 14tp
3hits: 21tp
4hits: 28tp
5hits: 36tp
6hits: 43tp
7hits: 50tp
8hits: 57tp
9hits: 64tp
10 hits: 72
This leads me to believe that the set gives Subtle Blow +8. If it was +9 I wouldn't get a 36tp return on 5 hits, that would be 35.5tp which SE rounds down.
It also can't be +7 because then I would get 29tp on 4 hits and not 28tp.