Remember, it's (Intimidation rate)/2 = Damage Bonus and PDT bonus, so the max would be like -~33% PDT against Lizards with all the right gear. You'd be sacrificing slots that you could just wear real PDT in, but you'd have a ~67% Intimidation Proc rate to go along with it.
To work through an example:
Tamer's Ring = +3% Intimidation Rate
15% base (10+5 merits) + 3% from Ring = 18%
15%/2 = 7.5% = 7% damage boost
18%/2 = 9% = 9% damage boost
9-7 = 2% increase (could be +3 or +4 at this point)
From that, we can tell that Tamer's Ring is +3% or +4% intimidation rate (even if it wasn't written as +3 in the description). Then you could put on your Beast Trousers:
16% Base (10+ 5 merits+ 1 trousers) + 3% from Ring = 19%
16%/2 = 8% = 8% damage boost
19%/2 = 9.5% = 9% damage boost (Combined with the above results, this shows it has to be +3)
By running it at an odd and even Killer effect level like this, you can figure out the exact value.
Interesting point on the Trait II possibilities. Unfortunately, Ferine Gausape is level 89. Unless I sync myself to 89 and Aquan Killer II happens to have been 90, I won't be able to tell. Also, I don't have any level 89 job on my mule and most people cruise straight to 90. I'll check if he has anything close that I can delevel though. It's an interesting possibility.
As far as your 19-20% intimidation rate, I'm not sure. You have to be aware there are some qualifications that come with KParser's "intimidation rate." I think it assumes the monsters have 10% Double Attack (1.1 attacks per round average), which is important because Intimidations negate entire attack rounds. That's why I got such an absurdly low proc rate when I parsed against Mandies. When I did my testing against Wamouracampa (no native DA), I just did (Intimidations)/(Hits + Misses). "Misses" includes Intimidations, Parries, etc.
I updated BGwiki with most of the testing, but feel free to add it where-ever. Speaking of which, I noticed on this page
that it claims all Birds have Aquan Killer. Personally, I don't feel this is the case. I think all Birds have Bird Affinity, which is 5% Intimidation Rate and +/-2% damage like our pets parse. What do you think?
List for tonight:
1) Bibiki Seashell (oops, haven't done the quest)
2) Massacre one of my mule's 90 jobs for the sake of science and test for Aquan Killer II - Nope, didn't work.
3) Hobgoblin Chocolate (probably 12), Bison Steak
Edit: Updated Test 5 and added Test 6 to the BG post. No super killer builds for us >:/ Edited, Jun 9th 2011 10:03pm by Byrthnoth