A. Correct Hazed. And also remember that "extensively used" isn't simply numbers used, but the percentage you'd likely see.
It's also a matter of unbalancing the arena. heck, having flown the 109 probly more than the spit, I don't see any problem in perking both the G10 and the Spit XIV. If you want an ueber109, take the G6. If you like the 109, well you have a choice: G2 or F4. (or soon, an Emil).
The orifice in question came in both 12-psi and 16-psi varieties. That means that it was applied to the Spit I sometime after the beginning of the BOB (when they moved from 86 to 100 octane, they took their time before kicking the MAP to 54 mm Hg), but they developed it and applied the orifice before they integrated it into the engine.