@Hortus:
Second, why do you think that set bonus is multiplicative with Rampage? Why 1.15(1+.15Y) but not (1+.15+.15Y)?
This is the math that I did, and it does indeed come out very differently. @Train explained that Rampage's boost is to the Offense that Ventress starts the encounter with. I'm not clear where Train got that info (or I wouldn't have done the calculation my/your way the first time), but it seems legit to me. In fact, the very fact that the two options (CD set & Offense set) track each other closely under Train's assumptions but Offense sets are clearly inferior under my assumptions makes it incredibly unlikely that the game would recommend Offense sets under my assumptions. Since the game does recommend Offense sets, that makes me think that Train's method is much more likely to be correct than my method, even without finding any clear statement from CG (or examining the code itself) confirming that 100%.
So i'm going with Train being right on this one.