The following test was done on Aura Pots while farming Ro'Maeve Water. I have exactly 1 merit in Triple Attack, and 1 merit in Dagger for anyone keeping track. I had 2 PCs running, and on the second PC I would write in notepad how many times I swung my weapon each attack round. for example, 2, 4, 2 means I swung 2 times, pause, 4 times, pause, 2 times. /NIN obviously, which explains why each round is a multiple of 2
2 4 2 2 2 2 4 2 2 2 2 2 2 2 2 2 2
2 2 2 2 2 2 2 2 2 4 2 4 2 2 2 2 2
2 2 2 2 2 2 2 2 4 2 2 2 2 4 2 2 2
2 2 2 2 4 2 4 2 2 2 2 4 2 2 4 2 2
2 2 2 2 4 2 2 2 2 2 2 2 4 4 2 2 2
2 2 2 2 2 2 2 2 2 4 2 4 2 2 2 2 4
2 2 2 4 2 2 2 2 2 4 2 2 2 2 2 2 2
2 2 2 2 2 2 2 2 2 4 2 4 2 2 2 2 2
2 4 2 2 2 2 4 2 4 2 2 2 2 2 2 2 2
2 2 2 2 4 2 2 4 2 2 2 2 2 2 4 4 4
2 4 2 4 2 2 2 2 2 2 2 2 2 2 4 2 2
2 4 2 4 2 4 2 2 2 2 2 2 2 4 2 2 2
2 2 2 2 2 2 2 4 2 2 2 2 2 2 2 2 2
2 4 2 2 2 2 2 2 2 4 2 4 2 2 2 2 2
2 4 2 2 2 4 4 2 2 2 2 2 2 4 2 2 2
2 2 4 2 2 4 2 2 2 2 4 6 4 2 6 2 4
2 2 2 2 2 2 2 2 4
I have already done the calculation and come up with my overall triple attack percent of 9.43%. However, I encourage you to do the calculation for yourself to confirm that I didn't make a mathematical error. Assuming it were exactly correct, this would mean that minus my 1% from merit I'm 8.43%, and minus the 5% base, i'm at 3.43%. In which case perhaps the Corazza would add somewhere in the neighborhood of Triple Attack +3.5%.
EDIT: Seems the 2.5% number didn't make it into this thread for some reason. It's well known from other parses the following information:
Base Triple Attack = 5%
Base Double Attack = 10%
Brutal Earring = 5%
If you notice, the Base Triple Attack and Base Double Attack rates make them equivalent What I mean is Triple Attack gives you twice as many extra hits as Double Attack. But Double Attack fires twice as often. This means the two traits are -equivalent- as far as swings/time is concerned.
Now, Brutal Earring is parsed at 5%, and the above parse shows Corazza at just under 3.5%. Due to the mass number of doubles and triples firing at the end of my parse, 2.5% is a safe conclusion because it fits perfectly into the "equivalence" of Double and Triple Attack that exists in their base rates.
Thanks