~80 AGI (guessing here) + 23 is 103, gives you capped dAGI for anything with up to ~28 AGI.
Player TP gain with Shellbuster should be 7.0, enemy TP gain is TP+3.
10*0.65=6.5*0.5=3.2 TP/hit (32 total) if you get a new level of the trait, 3.5 (35 total) if you don't.
EDIT:
Bahamut.Bojack said:
Ok here it is:
Shellbuster 264 Delay
+23 AGI
5/5 SB Merits
Death Wasp in Rolanberry Fields
10 Hits = 35% TP
Guess not then. A lot of traits haven't tiered up as expected, wonder why :\