I know that the Dragoon AF2 body always gives the same bonuses, from my own experience with it. Lumiere always has auto-regen when I call her /Whm, and always has Double Attack when I call her /War. I've also heard conflicting reports about other abilities, and haven't had a chance to parse her to see if she gains things like Attack Bonus/Defense Bonus from /War. Some people report that the Wyvern gains the JTs of a Dragoon, and thus has Accuracy Bonus II, and others; I know this is true of Dragon Killer, since I've seen her intimidate Sea Puks while soloing.
It would be interesting if someone with a parser went out and got their wyvern tanking a weaker mob to see if it gained Attack Bonus/Defense Bonus from /War; if both its attack and defense go up, we could probably assume that it does NOT gain the traits of a Drg (since Drg has its own Attack Bonus I trait).
I'm sure you found this out while researching, but to keep the trait on your wyvern you'll need to have the Wyrm Mail on every time you zone. To be precise, you need to have the Mail on when you call your wyvern, and zoning counts as calling a new one (for whatever reason). From my own playing around with Auto-Regen, I've found that if you call a wyvern in one zone without using the mail, then put the mail on and zone into the next area, it will have the auto-regen trait; simply putting the mail on after calling the wyvern does nothing. So as long as you have the mail on when you zone, regardless of any prior state, your wyvern will have your subjob traits.
XI Wiki

) is modified by Divine Magic only? does MND play a role even if minimal?
